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= <span id="KB171643"></span>Winlogon Hangs at the Log On Screen =<br />
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Article ID: 171643<br />
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Article Last Modified on 10/31/2006<br />
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APPLIES TO<br /><br />
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* Microsoft Windows NT Server 3.51<br />
* Microsoft Windows NT Server 4.0 Standard Edition<br />
* Microsoft Windows NT Workstation 3.51<br />
* Microsoft Windows NT Workstation 4.0 Developer Edition<br />
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This article was previously published under Q171643<br />
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== SYMPTOMS ==<br />
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Windows NT 4.0 Winlogon stops responding (hangs) at the logon screen after creating a blank system-environment variable.<br /><br />
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Windows NT 3.5x causes the computer to stop responding (hang) and displays the following error message:<br />
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c000021a fatal system error<br /><br />
The winlogon process has terminated unexpectely with a status of<br /><br />
0XC00000005 (0X000000000 0X000000000)<br />
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== RESOLUTION ==<br />
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You need to restart the system before you are able to log on to the computer again.<br />
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== STATUS ==<br />
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Microsoft has confirmed this to be a problem in Windows NT version 4.0. We are researching this problem and will post new information here in The Microsoft Knowledge Base as it becomes available.<br />
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Keywords: kbbug kbenv kbpending KB171643<br />
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