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"Windows cannot unload your registry class file" error message when you log off Terminal Services

This article has been archived. It is offered "as is" and will no longer be updated.
When you log off Terminal Services, you may receive the following Event ID 1000 event message:

Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1000
Windows cannot unload your registry class file. If you have a roaming profile, your settings are not replicated. Contact your administrator.
Access is denied

This problem may occur after Microsoft Windows Installer installs a program on the computer.
This problem occurs because of a registry handle leak in Windows Installer. This problem was first exposed after the installation of the MS03-026 security update.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


No prerequisites are required.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version            Size    File name   --------------------------------------------------------------   29-Dec-2004  13:22  2.0.2600.1534   2,018,304  Msi.dll             20-Sep-2003  19:23  2.0.2600.1267      64,512  Msiexec.exe         29-Dec-2004  13:22  2.0.2600.1183     305,664  Msihnd.dll          29-Dec-2004  13:22  2.0.2600.1183     847,872  Msimsg.dll          20-Sep-2003  19:23  2.0.2600.1183      39,936  Msisip.dll   
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For additional information about the MS03-26 security update, click the following article number to view the article in the Microsoft Knowledge Base:
823980 MS03-026: Buffer overrun in RPC may allow code execution
For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
profile does not unload unloaded Event ID: 11728 MsiInstaller

Article ID: 827825 - Last Review: 12/08/2015 04:35:29 - Revision: 7.6

Microsoft Windows 2000 Server, Microsoft Windows 2000 Professional Edition, Microsoft Windows 2000 Advanced Server

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