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Last Updated December 10, 2003

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Troubleshooting Hang Conditions

Troubleshooting a hang condition on a workstation or server can be an exercise in frustration. The problem could be related to hardware, third-party software, the Operating System itself, or combinations of hardware and software.  To make things a little easier, we've collected all of the Knowledge Base Articles we could find on conditions that cause Windows 2000 to hang
Troubleshooting Tools and Guides
How to Use the Userdump.exe Tool to Create a Dump File
Microsoft Knowledge Base Article: 241215 - You can use the Userdump.exe tool to generate a user dump of a process that shuts down with an exception or that stops responding (hangs). 

How to Troubleshoot Problems with Standby Mode, Hibernate Mode, and Shutting Down Your Computer in Windows 2000
Microsoft Knowledge Base Article: 266169 - You may experience one or more of the following symptoms: When you try to shut down your Windows 2000-based computer, the computer may stop responding (hang), possibly on a black screen. Also, your computer may hang or may not power off when the shutdown procedure reaches the "It is now safe to turn off your computer" screen; There is no Standby option when you try to shut down your computer; Your computer hangs or you receive a "stop 0x9F" error message when your computer is in Standby mode; There is no Hibernate option when you try to shut down your computer, and there is no Hibernate tab in the Power Options tool in Control Panel. 

HOW TO: Troubleshoot Shutdown Problems in Windows 2000 
Microsoft Knowledge Base Article: 315409 - This article describes general procedures that you can use to troubleshoot shutdown problems in Microsoft Windows 2000.

How to Troubleshoot Event ID 2021 and Event ID 2022 
Microsoft Knowledge Base Article: 317249 - The server computer briefly may stop responding (hang) and one or more of the following errors may be displayed in Event Viewer: Event ID: 2022 Source: Srv Description: Server was unable to find a free connection n times in the last seconds seconds.... 

Known issues that cause hang conditions...
16-bit Programs that Call to GlobalAlloc for Large Memory Allocations Cause Programs to Hang 
Microsoft Knowledge Base Article: 288165 - 16-bit programs that use the GlobalAlloc() API call for multiple large (1.5 to 8 megabyte) memory allocations in succession can cause programs to stop responding (hang). 

Active Directory MMC Tools Are Slow to Initialize 
Microsoft Knowledge Base Article 270915 - Active Directory Microsoft Management Console (MMC) utilities may be slow to initialize and run. They may also stop responding (hang) during the initialization procedure 

AGP Program May Hang When Using Page Size Extension on Athlon Processor
Microsoft Knowledge Base Article: 270715 - A Windows 2000-based computer may stop responding (hang) when you use an Accelerated Graphics Port (AGP) program such as Ziff Davis 3D WinBench 2000. This behavior may occur more frequently depending on the computer's processor, memory, and graphics configuration. This problem is known to occur with Nvidia GeForce 256 and Matrox G400 video adapters on computers with AMD Athlon processors. This issue is not specific to any specific video adapter type. 

Applications Hang When Printing to a Printer Set to "Use Printer Offline"
Microsoft Knowledge Base Article: 221092 -  When you attempt to print from an application on a computer running Windows 2000 to a printer that is set to Print Directly to Printer. When this is selected in combination with Use Printer Offline, the computer is put into a state where printing cannot take place, because the operating system cannot spool and store the job for later processing on behalf of the application. The application then continues to try to print until the printer is removed from Use Printer Offline state. 

Bugcheck 0x000000D1 Caused by Dlc.sys
Microsoft Knowledge Base Article: 266221 - Under certain circumstances when you are running an application that uses the data link control (DLC - protocol for network communications, your computer may stop responding (hang - and the following error message may be displayed on a blue screen.

Cannot Shut Down, Restart, Log Off, Stand By, or Hibernate When Computer Is Docked 
Microsoft Knowledge Base Article: 309645 - When you are using a docked computer, the computer may not be able to shut down, restart, log off, stand by, or hibernate. When you try to use any of these commands, the computer may appear to stop responding (hang ). 

Computer Hangs After You Connect Multiple IEEE 1394 Devices
Microsoft Knowledge Base Article: 290089 - After you connect multiple IEEE 1394-based devices on a computer with multiple CPUs, your computer may stop responding (hang). 

Computer Hangs When You Eject PC Card Network Adapter
Microsoft Knowledge Base Article: 227857 - If you eject a PC Card network adapter without properly stopping it and you then insert it again, your computer may stop responding (hang). 

The Computer Hangs After You Log On as a Guest and Change the Memory Protection for a Service 
Microsoft Knowledge Base Article: 291681 - If you log on to a computer as a guest and then change the memory protection for a service, the service may not work correctly and the computer may eventually stop responding (hang). 

Computer Hangs After You Restore the System State from a Backup
Microsoft Knowledge Base Article: 303383 - After you restore the Windows 2000 system state from a backup program, you are prompted to shutdown and restart the computer to complete the restoration. During shutdown, your computer may stop responding (hang) while the "Saving your Settings"

Computer Hangs During Shutdown Because of Resource Conflict
Microsoft Knowledge Base Article: 262575 - You may experience any of the following symptoms if you have PACE Interlok anti-piracy software installed on your computer. Interlok installs the Tpkd.sys driver, which uses the same IRQ as the Standard Floppy Disk Controller device. 

Computer Hangs If USB Composite Device Is Removed While Being Reset
Microsoft Knowledge Base Article: 278489 - Your computer may stop responding (hang) after you remove a Universal Serial Bus (USB) composite device. 

Computer Is Slow to Start and Event ID 7001 Messages Are Logged in the System Event Log
Microsoft Knowledge Base Article: 312945 - When you restart your Microsoft Windows 2000 Server-based computer, you may find that the computer appears to stop responding (hang) and takes an unexpectedly long time, up to 30 minutes, to start. When the computer starts, you may see Event ID 7001.

Computer May Hang After Using Sysprep on ACPI-Enabled Computer
Microsoft Knowledge Base Article: 259144 -  After you run Sysprep to build a master copy of a hard disk, the computer may stop responding (hang) with a blank desktop on an Advanced Configuration and Power Interface (ACPI) enabled computer. 

Computer May Hang When Hot-Swapping UDMA IDE Devices
Microsoft Knowledge Base Article: 266704 - When you are using Ultra DMA (UDMA) IDE devices (such as IDE hard disks or CD-ROM drives), hot-swapping the devices may cause the new device not to be reprogrammed to use UDMA mode. Hot-swapping with a new device may cause the new device to use an I/O mode other than UDMA. This in turn may cause the computer to stop responding (hang). 

Computer May Hang During ActiveMovie Installation
Microsoft Knowledge Base Article: 240378 - Your computer may stop responding (hang) during the installation of Microsoft ActiveMovie if a non-administrator installs or runs ActiveMovie for the first time after new hardware (such as a sound card) is installed. 

Computer May Hang During Resume from S3 Standby with Two IDE Drives 
Microsoft Knowledge Base Article: 323153 - A computer with two IDE drives on one cable may stop responding (hang) when the computer resumes from standby.

Computer May Hang on Restart After LUNs are Increased to 160+
Microsoft Knowledge Base Article: 261590 - When you restart your computer with an Emulex LP8000 Fibre Channel Host Adapter and Clarion 5 installed after you enable a large number of logical unit numbers (160+), your computer may stop responding (hang). 

Computer May Stop Responding with Object Auditing Enabled
Microsoft Knowledge Base Article: 263627 - When object auditing is enabled, your Microsoft Windows 2000-based computer may stop responding (hang). 

Computer Stops Responding During Windows 2000 DNS Query 
Microsoft Knowledge Base Article: 311309 - During DNS name resolution on your client computer, your computer may stop responding (hang), and this may happen in multiple processes including services. 

Computer Stops Responding When Starting Dual Boot with PowerQuest Partition Magic 3.x
Microsoft Knowledge Base Article: 284839 - When you start a dual-boot computer that is running Microsoft Windows 98 and Microsoft Windows 2000 Professional, and using PowerQuest Partition Magic 3.x, you may find that the computer stops responding.

Computer Stops Responding with Event ID 2022 
Microsoft Knowledge Base Article: 245077 - Your Windows-based server may become unresponsive. The server may recover on its own or you may have to restart it. The server's clients are disconnected or stop responding (hang), and Event ID 2022 is logged in the system event log.

Computer Stops Responding or Stop Error Occurs When Scsiport.sys Requests Memory Allocation 
Microsoft Knowledge Base Article: 308214 - When the SCSI port driver (the Scsiport.sys file) makes a memory allocation request, your computer may stop responding (hang) or the Memory Manager may quit, and you receive the following error on a blue screen: 

Computer Stops Responding When Starting Dual Boot with PowerQuest Partition Magic 3.x 
Microsoft Knowledge Base Article: 284839 - When you start a dual-boot computer that is running Microsoft Windows 98 and Microsoft Windows 2000 Professional, and using PowerQuest Partition Magic 3.x, you may find that the computer stops responding. 

Computer with Large Number of Partitions Starts Slowly 
Microsoft Knowledge Base Article: 274349 - When you start your computer and it has a large number of partitions defined in the Disk Management MMC snap-in, startup may take an excessively long time to complete. Your computer may appear to stop responding (hang) while the "Starting Windows 2000" message is displayed, and the status bar may pause between 50 and 70 percent.

Deadlock Condition Causes Socket Programs to Become Unresponsive
Microsoft Knowledge Base Article: 278522 - In Windows 2000 Service Pack 1 (SP1), calls to the Socket function may not be returned, causing the creation of sockets not to succeed. Therefore, socket programs may become unresponsive and cause 100 percent CPU usage. 

Deadlock in USB Stack While Resuming from Suspend
Microsoft Knowledge Base Article: 302450 - When you resume a system with a universal serial bus (USB) keyboard and a USB mouse by using the keyboard, the system may not resume. This problem may occur intermittently. The system appears to stop responding (hang) when this problem occurs. 

Explorer.exe Hangs on ALT+F4 If Shutdown Restrictions Are in Use
Microsoft Knowledge Base Article: 279713 - When you click the desktop and then press ALT+F4, you may receive the following message in a Restrictions dialog box: This operation has been cancelled due to restrictions in effect on this computer. Please contact your system administrator 

High CPU Utilization on Compaq Laptops When You Play a DVD Movie
Microsoft Knowledge Base Article: 282021 - When you play a DVD movie on a Compaq M700 or E700 laptop computer, CPU usage may reach 100 percent after approximately 15-20 minutes, and this may cause the computer to be very slow or to appear to stop responding (hang). 

Microsoft IntelliMouse Is Not Detected or Causes Hang in Windows 2000
Microsoft Knowledge Base Article: 226015 - If there is a Microsoft IntelliMouse connected to your computer, the IntelliMouse may not be detected or your computer may stop responding (hang). 

MMC May Hang When You Use the DNS Snap-In to View More than 16,000 Zones
Microsoft Knowledge Base Article: 286779 - When you try to view the properties of a Domain Name System (DNS) zone by using the Microsoft Management Console (MMC) snap-in and there are more than 16,000 zones defined in the DNS database, MMC may generate an access violation error message and stop responding (hang). 

Monitor Displays a White Screen at Startup and Windows 2000 Stops Responding 
Microsoft Knowledge Base Article: 305227 - After you start your computer, the monitor may display a blank white screen and the computer may stop responding. 

NetBIOS Scopes May Cause Domain Controllers to Hang When You Start Your Computer 
Microsoft Knowledge Base Article: 272262 - When you start your computer, a Windows 2000-based domain controller that uses network basic input/output system (NetBIOS - scopes may stop responding (hang - for an extended amount of time. When this occurs, the Preparing Network Connections dialog box is displayed and you computer may hang for several hours.

Hardware Malfunction Results in System Error Message
Microsoft Knowledge Base Article: 222973 - During the Windows NT boot process, the computer may stop responding (hang) and the following error message may appear: *** Hardware Malfunction Call your hardware vendor for support *** The system has halted ***  

Logon Process Hangs After Encrypting Files on Windows 2000
Microsoft Knowledge Base Article: 269397 - After you encrypt files on your Windows 2000-based computer, the computer may stop responding (hang) during the logon process. When this occurs, no users can log on to the computer. 

NetBIOS Scopes May Cause Domain Controllers to Hang When You Start Your Computer 
Microsoft Knowledge Base Article: 272262 - You computer may stop responding (hang) for several hours while the Preparing Network Connections dialog box is displayed

Ntldr Cannot Load Fragmented System Hive
Microsoft Knowledge Base Article: 265509 - Your computer may stop responding (hang) during startup from a hard disk that uses the NTFS file system if the System hive file is too large. The System hive file is located in the %SystemRoot%\System32\Config folder. 

Parallel Port Clik! Windows NT Device Driver May Hang Windows 2000
Microsoft Knowledge Base Article: 247707 - If you install the parallel port drivers for Microsoft Windows NT 4.0 for the Iomega Clik! drive in Windows 2000, you may not be able to start Windows 2000 or Windows 2000 may stop responding (hang) at the startup screen. 

Plug and Play Event Processing May Stop Functioning After the Surprise Removal of Certain PCI Devices 
Microsoft Knowledge Base Article Q288113 - If a Peripheral Component Interconnect (PCI - device is removed from a fault-tolerant system, the PCI driver may cause Plug and Play event processing to stop responding (hang - when certain devices are unexpectedly removed ("surprise removal") 

Printers Folder May Hang if You Type an Incorrect URL in the Add Printer Wizard and Use Basic Authentication
Microsoft Knowledge Base Article: 244917 - When you attempt to connect to an Internet print server by typing a URL in the Add Printer Wizard, if you type a URL with incorrect syntax followed by several successful connections to an Internet print server that uses Basic (clear text) authentication, the Printers folder on the server may stop responding (hang). 

Program Hangs Because of Deadlock in Ntdll
Microsoft Knowledge Base Article: 271182 - A program may stop responding (hang) indefinitely. When this occurs, you must restart the program or process. This problem is most likely to occur on computers with multiple processors. 

Program Hangs During Unload with Secure Connection 
Microsoft Knowledge Base Article: 238934 - If you use a program that dynamically links to a DLL dynamic-link library (DLL -, which connects to a secure server using Secure Sockets Layer (SSL - and using Wininet.dll APIs, the program may not unload properly and may stop responding (hang) 

Program That Runs Multiple I/O Operations to Multiple Fiber Channel Disks May Hang 
Microsoft Knowledge Base Article: 302895 - A program that runs multiple I/O operations to fiber channel disks that are connected to a storage router may stop responding (hang) after the network connection is lost. 

Receiving Many Simultaneous H.323 Requests Causes a Computer with ISA Server Installed to Hang
Microsoft Knowledge Base Article: 271379 - After a few seconds of receiving a few hundred simultaneous H.323 requests, a computer that has Microsoft Internet Security and Acceleration (ISA) Server installed may stop responding (hang). 

File Server Stops Responding (Hangs) When You Rename a File 
Microsoft Knowledge Base Article: 810340 - When you rename a file on a remote Windows 2000-based file server, the file server may stop responding (hang). 

The Redirector Hangs When You Log On
Microsoft Knowledge Base Article: 291043 - Under the following circumstances, your client computer may stop responding (hang) when you log on: Security signatures are enabled on the server, there is an existing null or guest session prior to a user session, the client has an outstanding request to the server on the null or guest session, and the client establishes a user session. 

RIS Client May Hang in Text-Mode Setup on a Network Without NetBIOS
Microsoft Knowledge Base Article: 243500 -  When you are installing Windows 2000 from a Windows 2000-based Remote Installation Service (RIS) server using a RIS Pre-Boot Execution Environment (PXE) client, the installation may stop responding (hang) during the Text-mode portion of Setup 

RPC Server Service Stops Responding
Microsoft Knowledge Base Article: 272303 - If a malicious user transmits a malformed Remote Procedure Call (RPC) client packet to a Windows 2000-based computer, the RPC Server service on the host computer may stop responding (hang). If this occurs, you must restart the host computer.

SCSI Port Driver May Cause Your Computer to Hang
Microsoft Knowledge Base Article: 275620 - When you are using your Windows 2000-based computer, your computer may become unstable, it may stop responding (hang), and you may experience one or more of the following symptoms: 

Slow Boot or Error Messages in Windows 2000 After Installing Roxio Easy CD Creator 5.0
Microsoft Knowledge Base Article: 298583 - Immediately after you install Roxio Easy CD Creator 5.0 Platinum, you may receive an error message on a blue screen and the computer may stop responding (hang), or the computer may take a long time to start. 

SMTP Service Hangs When Handling Many Domains 
Microsoft Knowledge Base Article Q274417 - The Simple Mail Transport Protocol (SMTP - service may become unresponsive (hang - for several minutes or more if many domains are configured in the metabase. 

Startup Scripts May Appear to Hang Windows 2000
Microsoft Knowledge Base Article: 256320 - Your Windows 2000-based computer may appear to stop responding (hang) if the computer has a local policy that runs a startup script that may require user input. For example, if you have a startup script for "The Local Computer", and the script connects to domain resources and you move the machine to a workgroup, you do not see the dialog box that is requesting logon credentials for the resource. The computer will stay in this condition until you reach the timeout value for group policy scripts, and you receive the following message: Please Wait: Running Startup Scripts

The Cursor Behaves Erratically, the Computer Stops Responding, and Performance Is Noticeably Slow 
Microsoft Knowledge Base Article: 309055 - On a computer that runs Windows 2000, the cursor may become erratic and behave abnormally. The computer may stop responding (hang) and may need to be restarted. Computer performance may be noticeably slower. 

The Windows NT 4.0 Domain Controllers That Are Upgraded to Windows 2000 May Hang During the Final Phase of Setup
Microsoft Knowledge Base Article: 273823 - When you upgrade your computer from Windows NT 4.0 to Windows 2000 and the Winnt32.exe program is being run, the Windows NT 4.0 domain controllers that have large-sized Security Accounts Manager (SAM) account databases may seem to hang for excessive periods of time during the "Performing final tasks" phase of the upgrade. Under extreme circumstances, the computer may hang for up to 2.5 hours. 

ThinkPad Computer May Hang During the Startup Process with a ZIP Drive in the Docking Station 
Microsoft Knowledge Base Article: 279757 - When you enable direct memory access (DMA) for the integrated drive electronics (IDE) controller on an IBM ThinkPad docking station and you have an Iomega 250 megabyte (MB) Zip drive in the docking station, your computer may stop responding. 

Video Hangs When Running 3D Graphics Programs
Microsoft Knowledge Base Article: 261606 - When you run a program that uses 3D AGP functions on a Windows 2000-based computer that contains the VIA AGP chip set, the computer may stop responding (hang). 

Your Computer May Hang If the OemPnPDriversPath Value Is Longer Than 98 Characters  
Microsoft Knowledge Base Article: 307950 - Your computer may stop responding (hang) if the data value of the OemPnPDriversPath value in the following registry key contains more than 98 characters: HKLM/SOFTWARE/Microsoft/Windows/Current Version/DevicePath 

Windows 2000 May Hang on Toshiba 8100 Laptop
Microsoft Knowledge Base Article: 256144 - While you are using your Toshiba 8100 laptop computer, the computer may become unresponsive, or appear to stop responding (hang). Also, the central processor unit (CPU) may appear in Task Manager to be running at 100 percent, even if there...

Windows 2000 May Hang with USB Devices on Older Via Chip Set
Microsoft Knowledge Base Article: 246755 - When you are using certain Universal Serial Bus (USB) devices on a motherboard with the Via chip set in Windows 2000, you may experience any of the following symptoms: 

Windows 2000 Hangs at "Preparing Network Connections" Screen on Multiple-Processor Computers
Microsoft Knowledge Base Article: 266132 - Windows 2000 may stop responding (hang) on multiple-processor computers during startup when the "Preparing Network Connections" screen is displayed. When this problem occurs, you may find the following entry in the registry: 

Windows 2000 Hangs at "Setup Is Starting Windows 2000" Message
Microsoft Knowledge Base Article: 234772 - This article lists troubleshooting steps to try if Windows 2000 Text-mode Setup stops responding (hangs) while displaying the "Setup is starting Windows 2000" message.

Windows Hangs at "Loading Machine Info" with HighPoint UltraDMA ATA/66 Controller
Microsoft Knowledge Base Article: 243018 - If you start your computer using a Windows 2000 CD-ROM to install Windows and you have installed a HighPoint UltraDMA ATA/66 hard disk controller, the computer may stop responding (hang) while the following information is displayed: Loading Machine Information. You cannot press F6 to install a secondary controller driver. If you upgrade from Windows NT 4.0 or Windows 95/98, you may receive the following error message: Stop 0x0000007b INACCESSIBLE_BOOT_DEVICE  This issue occurs because there is not a Windows 2000 compatible driver for the HighPoint UltraDMA ATA/66 hard disk controller 

Windows Hangs with Fragmented IP Datagrams 
Microsoft Knowledge Base Article: 259728 - Windows may become sluggish, or may stop responding (hang). You may also notice that the System process is consuming most or all of the CPU resources. 

Windows 2000 Professional May Hang During Shutdown with Veritas Backup Exec Desktop Edition 4.4.1
Microsoft Knowledge Base Article: 269696 - After you install Veritas Backup Exec Desktop Edition version 4.4.1, Windows 2000 Professional may stop responding (hang) during shutdown. 

Windows 2000 Setup Seems to Hang on Compaq Servers
Microsoft Knowledge Base Article: 249686 - When you are installing Windows 2000 on a Compaq server, Setup may seem to stop responding (hang) during the GUI-mode portion of the installation because the keyboard and mouse stop responding. 

Windows 2000 Shutdown Process Stops and Error Message Refers to Devldr Program
Microsoft Knowledge Base Article: 296838 - When you attempt to shut down your computer and then restart it, an error message may report that the Devldr program is not responding. When you click End Now, the shutdown process may stop and the computer may stop responding. 

Windows 2000 SP1 Computer Hangs When You Use IEEE 1394 Digital Camera in NetMeeting
Microsoft Knowledge Base Article: 272295 - When you try to start an Institute of Electrical and Electronics Engineers (IEEE) 1394 digital camera in Microsoft NetMeeting, your computer may stop responding (hang). Note that this problem only occurs with Windows 2000 Service Pack 1-based computers.

Windows 2000 Stops Responding After a Surprise Removal of a USB OHCI Controller 
Microsoft Knowledge Base Article: 323937 - When you hot unplug an OHCI USB controller to which one or more USB-based devices are connected, you may receive an error message on a blue screen, and your computer may stop responding (hang). 

Windows 95/98 Clients Hang with "Mprexe.exe Not Responding" Error Message
Microsoft Knowledge Base Article: 234647 - Windows 95 clients using Microsoft distributed file system (Dfs) or Windows 98 clients may stop responding (hang) in any of the following situations: 

Windows Hangs During SBLive! Full Duplex Audio Test
Microsoft Knowledge Base Article: 278650 - When you try to run the full duplex automated test for a Creative Labs SBLive! sound card, Windows may stop responding (hang). 

Windows Hangs with Fragmented IP Datagrams
Microsoft Knowledge Base Article: 259728 - Windows may become sluggish, or may stop responding (hang). You may also notice that the System process is consuming most or all of the CPU resources. 

Windows May Appear to Hang When a Mirrored IDE Drive Fails
When you perform Windows mirroring on a computer using IDE drives and the master drive on the primary channel fails, the system may appear to stop responding. You may also experience very erratic mouse movement. This can happen even if the system... 

Windows NT Seems to Hang During Boot and Slow Performance
Microsoft Knowledge Base Article: 157910 - After you install Windows NT version 4.0 on a computer configured with a Quantum XP-32150 SCSI hard disk connected to an Adaptec AHA-1542b SCSI controller, you may experience one or more of the following symptoms: 

Windows Setup Hangs When "Setup Is Starting Windows" Screen Appears 
Microsoft Knowledge Base Article: 217073 - During text-mode Setup in Windows, your computer may stop responding (hang) when the "Setup is starting Windows" screen appears, and you may have to restart it. 

Your Computer May Hang if You Install Service Pack 1 After Installing Windows 2000 High Encryption Pack
Microsoft Knowledge Base Article: 270842 -  When you install Service Pack 1 (SP1) for Windows 2000, your computer may stop responding (hang) at the "Preparing Network Connections" portion of startup. 

Your Computer May Hang When Running in ACPI Mode
Microsoft Knowledge Base Article: 266344 - When your Windows 2000-based computer that is running in Advanced Configuration and Power Interface (ACPI) mode uses the ACPI Power Management Timer (PMTimer) as a high resolution counter, you may experience any of the following symptoms: 

Your Computer May Pause with a Black Screen If You Press ESC During Startup 
Microsoft Knowledge Base Article: 311799 - If you press the ESC key while your computer is starting, your computer may pause with a black screen. If this problem occurs, you can press any other key to resume the startup process. 

Your Windows 2000-Based Computers Stops Responding While You Work with Multiple Programs
Microsoft Knowledge Base Article: 307323 - While you are working with various programs, your computer may abruptly stop responding (hang).

Xircom CreditCard Ethernet+Modem 28.8 and 33.6 May Hang with Heavy Use
Microsoft Knowledge Base Article: 246997 - When you use a Xircom CreditCard Ethernet+Modem 28.8 adapter or a Xircom CreditCard Ethernet+Modem 33.6 adapter on a portable computer running Microsoft Windows 2000 Professional, the adapter may stop responding (hang) under heavy use. 

 

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