Microsoft KB Archive/168585

From BetaArchive Wiki
Knowledge Base

Stop C000021A After Re-Applying Windows NT v4.0 SP1

Article ID: 168585

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q168585


After you re-apply the Windows NT 4.0 Service Pack 1 to a Windows NT 4.0 system that previously had Windows NT Service Pack 2 installed, you may receive the following blue screen error message on startup:

Stop: C000021A {Fatal system Error}
The Session Manager Initialization System Process Terminated
Unexpectedly with a status of 0xc0000003 (0x00000000, 0x00000000)
The system has been shutdown.


The system has a mixture of Windows NT 4.0 Service Pack 1 and 2 files installed. This error should only occur on systems that had Service Pack 2 removed by using an Emergency Repair Diskette. A bug in the Windows NT emergency repair process prevents the Service Pack 2 files from being replaced during Emergency Repair.

For more information, please see the following articles in the Microsoft Knowledge Base:

168015 Files Not Replaced When Running Emergency Repair


Follow the steps in Knowledge Base article 168015 to perform an emergency repair. Choose the option to verify Windows NT system files, and replace all files that are different. This will put the system back to no service pack condition and allow Service Pack 1 to be reinstalled.

Additional query words: SP1 SP2 Repair Emergency

Keywords: kbsetup KB168585