If more than one user is logged on to your Microsoft Windows XP-based computer and if the Fast User Switching feature is enabled, Windows may unexpectedly stop responding (hang) when you log off. The welcome screen is not displayed, and the screen is black.
If you press any one of the following keyboard shortcuts, nothing happens:
- Windows logo key+L
This problem may occur if a program is running in the context of another user who is logged on to the computer. For example, this problem may occur if all the following conditions are true, in the order that they are presented in:
- You log on to the computer as one user.
- You switch to another user without logging off as the first user.
- You run a program in the context of the first user.
- You log off the computer as the second user.
In this situation, a process is not ended correctly in Windows XP.
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
How to obtain the latest Windows XP service pack
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. 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.
No prerequisites are required.
You must restart your computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
The English version of this hotfix has the file attributes (or later) 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-Jan-2004 18:31 5.1.2600.1331 32,768 Cfgbkend.dll
29-Jan-2004 18:31 5.1.2600.1331 33,792 Pchsvc.dll
29-Jan-2004 18:31 5.1.2600.1331 39,424 Racpldlg.dll
29-Jan-2004 18:31 5.1.2600.1331 44,032 Regapi.dll
29-Jan-2004 18:31 5.1.2600.1331 41,472 Safrslv.dll
29-Jan-2004 18:31 5.1.2600.1337 16,384 Seclogon.dll
29-Jan-2004 18:31 5.1.2600.1337 200,192 Termsrv.dll
29-Jan-2004 18:31 5.1.2600.1331 88,064 Tscfgwmi.dll
28-Jan-2004 23:57 5.1.2600.1337 586,752 Xpsp2res.dll
10-Jan-2004 12:48 5.1.2600.1331 130,560 Sessmgr.exe
Windows XP, 64-bit editions
Date Time Version Size File name Platform
29-Jan-2004 17:51 5.1.2600.1331 104,448 Cfgbkend.dll IA-64
29-Jan-2004 17:51 5.1.2600.1331 110,592 Pchsvc.dll IA-64
29-Jan-2004 17:51 5.1.2600.1331 106,496 Racpldlg.dll IA-64
29-Jan-2004 17:51 5.1.2600.1331 127,488 Regapi.dll IA-64
29-Jan-2004 17:51 5.1.2600.1331 111,616 Safrslv.dll IA-64
29-Jan-2004 17:51 5.1.2600.1337 46,592 Seclogon.dll IA-64
29-Jan-2004 17:51 5.1.2600.1337 622,592 Termsrv.dll IA-64
29-Jan-2004 17:51 5.1.2600.1331 326,144 Tscfgwmi.dll IA-64
29-Jan-2004 18:31 5.1.2600.1331 44,032 Wregapi.dll x86
29-Jan-2004 18:31 5.1.2600.1337 16,384 Wseclogon.dll x86
28-Jan-2004 23:57 5.1.2600.1337 586,752 Wxpsp2res.dll x86
28-Jan-2004 23:57 5.1.2600.1337 586,240 Xpsp2res.dll IA-64
10-Jan-2004 11:40 5.1.2600.1331 423,424 Sessmgr.exe IA-64
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.
For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
New file naming schema for Microsoft Windows software update packages
For additional information about standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:
Description of the standard terminology that is used to describe Microsoft software updates