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Posted 07 March 2017 - 11:52 PM
Posted 08 March 2017 - 06:48 AM
This error occurs when a user-mode subsystem, such as WinLogon or the Client Server Run-Time Subsystem (CSRSS), has been fatally compromised and security can no longer be guaranteed. In response, the operating system switches to kernel mode. Microsoft Windows cannot run without WinLogon or CSRSS. Therefore, this is one of the few cases where the failure of a user-mode service can shut down the system.
Mismatched system files can also cause this error. This can occur if you have restored your hard disk from a backup. Some backup programs might skip restoring system files that they determine are in use.
Running the kernel debugger is not useful in this situation because the actual error occurred in a user-mode process.
Resolving an error in a user-mode device driver, system service, or third-party application: Because bug check 0xC000021A occurs in a user-mode process, the most common culprits are third-party applications. If the error occurred after the installation of a new or updated device driver, system service, or third-party application, the new software should be removed or disabled to isolate the cause. Contact the manufacturer of the software about a possible update.
Resolving a mismatched system file problem: If you have recently restored your hard disk from a backup, check if there is an updated version of the Backup/Restore program available from the manufacturer.
These steps may be helpful in gathering additional information.
Look at the most recently installed applications. To do this navigate to "Uninstall or change a program" in control panel and sort the installed applications by install date.
Check the System Log in Event Viewer for additional error messages that might help pinpoint the device or driver that is causing the error. For more information, see Open Event Viewer. Look for critical errors in the system log that occurred in the same time window as the blue screen.
These steps may be helpful in resolving this issue.
Use the System File Checker tool to repair missing or corrupted system files. The System File Checker is a utility in Windows that allows users to scan for corruptions in Windows system files and restore corrupted files. Use the following command to run the System File Checker tool (SFC.exe).
Try booting in to safe mode and removing any strange 3rd party software.
Otherwise you might want to make a clone of that HDD on another PC and re-install Windows. Then mount the backed up HDD image and restore any files you need from it manually.
Edited by newage, 08 March 2017 - 06:50 AM.
Posted 08 March 2017 - 07:39 AM
Cloning a corrupted installation is not a good idea.
What do you mean when you say "restarting or shutting down does not work"?
Posted 08 March 2017 - 08:38 AM
@BC Advisor Sorry I should have clarified. Cloning the HDD to a virtual image so you can restore manually any files you want. Use that HDD to install a new copy of Windows on.
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