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Last Updated December 10, 2003

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Troubleshooting the Windows 2000 Registry

For those new to Windows 2000, the Registry is where the Operating System stores most of its configuration data. Almost everything you do in the Windows 2000 GUI, is ultimately translated into an entry in the Registry. Fortunately, Microsoft allows Administrators the capability to edit the Registry directly to fine tune parameters and make some custom tweaks.  On the down side, haphazard edits to the Registry is the surest way we know to cripple a perfectly good system.
 DO NOT edit the Registry if you don't know what you're doing. And always back it up first. You've been warned.
Where to Start...
Troubleshooting and configuring the Windows NT/95 Registry Recommended!!!
A online book available from the Macmillan Library. Free online registration required.

How To Export WinNT Registry Entries from a Command Prompt
Microsoft Knowledge Base Article: 168589 - The contents of the Windows NT 4.0 or Windows 2000 registry can be exported to a text file without starting Registry Editor.

How NT Protects Its Hives
Windows NT has some built-in methods for protecting system hive files. Source: Windows & .NET Magazine (Dec 1996)

Reconstructing a Corrupted Registry  
Article by Brien Posey, reprinted from TechRepublic. Source: Microsoft TechNet CD Online.

RegClean 4.1a Description and General Issues
Microsoft Knowledge Base Article: 147769 - When you install, uninstall, and reinstall programs on your computer, registry keys are created, modified, or deleted. Over time, your computer's registry may begin to contain corrupted, unused, and unnecessary registry keys, etc., (updated 3/30/2000) 

Using System.alt to Recover the System Hive
Microsoft Knowledge Base Article: 151247 - If your system fails to boot because the System hive is corrupt, it may be possible to rename the System.alt file to System to recover Windows NT. This file is located in the Systemroot\System32\Config directory. It is recommend to first try to use the Emergency Repair Disk (ERD) to recover the System hive.

Known Bugs and Issues...
Cannot Back Up Registry or Event Logs on Dynamic Volumes
Microsoft Knowledge Base Article: 260913 - In Windows 2000, the Backup tool (Ntbackup.exe) cannot back up or restore the registry or event logs on Dynamic volumes.

Error Messages When You Try to Log On to a Secure Web Site if Registry Key Is Damaged or Invalid
Microsoft Knowledge Base Article: 259537 - When you try to use Internet Explorer to log on to a secure Web site, you may receive one or both of the following error messages:

Incorrect Permission in Registry Cause Unpredictable Results
Microsoft Knowledge Base Article: 139342 - If you have incorrect permissions set in the Windows NT LanmanServer registry keys, unpredictable results occur. Following are some examples:

Incorrect Range for RegistrySizeLimit in Resource Kit
Microsoft Knowledge Base Article: 125860 - The Windows NT Registry Entries Help File, REGENTRY.HLP, included with the Resource Kit for Windows NT 3.5 incorrectly specifies the RegistrySizeLimit parameter range as from "4 Bytes to Unlimited." The correct range is "4 Megabytes to Unlimited

Regedt32.exe Truncates REG_MULTI_SZ Entries Longer Than 1,024 Characters
Microsoft Knowledge Base Article: 269629 - Regedt32.exe splits a string that is longer than 1,024 characters by inserting a null character within the string after 1,024 characters. If you open a REG_MULTI_SZ value that has a string that is longer than 1,024 characters and click OK to save it, the string is split after 1,024 characters and a null character is inserted.

Registry Entries for Identical Devices Not Updated After Updating Driver for One Device
Microsoft Knowledge Base Article: 266266 - If two or more identical devices (for example, network or SCSI adapters) are installed and you use Device Manager to update one device, the new driver is installed and the driver information (provider, date, and version) is updated. (updated 1052000)

Registry Handles Leaked in Winlogon When Canceling Drive Reconnect Dialog Box 
Microsoft Knowledge Base Article: 266655 - When Windows 2000 is attempting to reconnect user-mapped drives during the logon process, a dialog box that you can use to cancel the operation is displayed. If, during this process, a drive is not available and you click Cancel, Windows 2000 may leak registry event handles

Registry Quota Leak In Windows 2000
Microsoft Knowledge Base Article: 260241 - Certain registry operations may cause the registry size that is reported in the user interface to be miscalculated. The operations that lead to this condition do not commonly occur. However, if this condition does occur, the reported current

Registry Size Limit Change Results in PagedPoolSize Change
Microsoft Knowledge Base Article: 140364 - When changing the registry size, the entry for PagedPoolSize may be automatically changed from its default setting of zero to a fixed value. This could result in unexpected and or undesirable behavior on a Windows NT server.

Running RegClean 4.1 Causes Access Violation in Windows NT 4.0
Microsoft Knowledge Base Article: 172575 - When you run RegClean version 4.1 in Windows NT 4.0, you may receive the following error message: Application Error RegClean.exe Exception: access violation(0xc0000005), address:0x00414053 This error message occurs because RegClean version 4.1 is not compatible with Windows NT 4.0.

SendPort DNS Registry Key Does Not Work as Expected
Microsoft Knowledge Base Article: 260186 - When you upgrade your Microsoft Windows NT 4.0-based computer that is running Domain Name Service (DNS) to Windows 2000, you may experience name resolution issues.


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