The system may not unload your user profile correctly when you log off from a Windows XP-based computer
Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1524
Windows cannot unload your classes registry file - it is still in use by other applications or services. The file will be unloaded when it is no longer in use.
The HKEY_CURRENT_USER\Software\Classes registry subkey is the Usrclass.dat file in your user profile. The HKEY_CURRENT_USER\Software\Classes registry subkey is used for per-user COM registrations. Therefore, the HKEY_CURRENT_USER\Software\Classes registry subkey cannot be unloaded when you log off from the computer because of the cached handle.
Hotfix informationA 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
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, contact 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.
PrerequisitesYou must have Windows XP SP2 installed to apply this hotfix.
Restart requirementYou must restart the computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace any other hotfixes.
File informationThe 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 item in Control Panel.
|File name||File version||File size||Date||Time||Platform||SP requirement||Service branch|
To download and install UPHClean, visit the following Microsoft Web site:
When the problem that is described in this article occurs, the HKEY_CURRENT_USER\Software\Classes registry subkey does not appear in the registry the next time that the user logs on to the computer. Therefore, the per-user COM registrations are missing.
Article ID: 842827 - Last Review: 12/08/2015 07:27:38 - Revision: 2.0
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