The stylus pen may no longer work after you install a hotfix for Windows XP Tablet PC Edition 2005

You may experience any of the following symptoms on a Microsoft Windows XP Tablet PC Edition 2005-based computer:

• When you start Windows XP Tablet PC Edition 2005, you receive the following message:
  Windows is starting up
  Then, Windows stops responding.
• The Tablet PC Component (Tpgwlnot.dll) may leak handles in the WinLogon and Default desktops processes. This problem may occur if you repeatedly press CTRL+ALT+DEL and then press ESC.
• After you install an earlier version of the hotfix that is described in this article, you experience any of the following symptoms:
  • The stylus pen no longer works.
  • After you repeatedly log on and log off, the position of the stylus pen may not synchronize with the position of the pointer on the screen.
  • When you rotate the welcome screen, the pointer does not move in the same direction as the stylus pen. For example, when you move the stylus pen vertically, the pointer moves horizontally.
    
    For more information about this problem, click the following article number to view the article in the Microsoft Knowledge Base:
    926411   (http://support.microsoft.com/kb/926411/ ) The movement of the pointer does not match the movement of the stylus pen in Windows XP Tablet PC Edition 2005
• On a Windows XP Tablet PC Edition 2005-based computer that has a dual-core processor, the location of the pointer does not match the location where you point with a pen. The problem is more apparent the closer that you move the pointer to the Turn Off button. For more information about when this problem occurs, see the "More Information" section.

The first symptom that is mentioned in the "Symptoms" section is caused by a deadlock between the Tablet PC Component and the Winlogon.exe process. After a thread in the Winlogon.exe process acquires the loader lock, the thread queues a local procedure call message to the Winlogon.exe process.

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. 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.

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 item in Control Panel.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

On a Windows XP Tablet PC Edition 2005-based computer that has a dual-core processor, the location of the pointer may not match the location where you point with a pen. This problem may occur in the following scenario:

1. You switch from landscape mode to tablet mode.
2. You click Start, and then click Log Off.
3. In the Log Off Windows box, you click Switch User and then log on to the computer.

For more information, click the following article number to view the article in the Microsoft Knowledge Base: