Microsoft KB Archive/922410

= Error message when you restart a computer that is running Windows XP Professional: &quot;Stop 0xC000021A&quot; =

Article ID: 922410

Article Last Modified on 10/8/2007

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APPLIES TO


 * Microsoft Windows XP Professional

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SYMPTOMS
When you restart a computer that is running Microsoft Windows XP Professional, you may randomly receive the following error message:

Stop 0xC000021A

Note You may experience this problem more frequently if Group Policy is applied immediately before the computer is restarted.

This problem occurs if the Winlogon.exe program crashes during the Windows startup process. In this situation, a &quot;Stop 0xC000021A&quot; error message occurs.



CAUSE
This problem occurs if the Wbemprox.dll library is unloaded prematurely. In this situation, the Component Object Model (COM) proceeds with the unload operation because the following conditions are true:
 * COM does not detect that a particular thread is still using COM.
 * The particular thread has the Wbemprox.dll library on its call stack.

This problem occurs because the Userenv.dll library does not call the CoInitialize function on the particular thread.



Hotfix information
A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
Because of file dependencies, you must be running Windows XP Service Pack 2 (SP2) to apply this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

Restart requirement
You must restart the 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 item in Control Panel.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more 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

Keywords: kbwinxppresp3fix kbfix kbbug kbhotfixserver kbqfe kbpubtypekc KB922410

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