Cannot Boot Windows Server After Installing Update 0Xc000021a
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How to Fix the 0Xc000021a Error on Windows Server
If you have installed a recent update on your Windows Server and encountered the 0Xc000021a error, you may not be able to boot your system normally. This error indicates that a critical system process has terminated unexpectedly, causing the system to shut down. In this article, we will show you some possible solutions to fix this error and restore your Windows Server to normal operation.
Method 1: Use the Startup Repair Tool
The Startup Repair tool is a built-in feature of Windows that can automatically diagnose and repair common boot problems. To use this tool, you need to boot your system from a Windows installation media (such as a DVD or USB drive) and follow these steps:
Insert the Windows installation media into your system and restart it.
Press any key when prompted to boot from the media.
Select your language, time, keyboard, and click Next.
Click Repair your computer on the lower-left corner of the screen.
Select Troubleshoot > Advanced options > Startup Repair.
Wait for the tool to scan and fix any boot issues.
Restart your system and see if the error is resolved.
Method 2: Uninstall the Problematic Update
If the 0Xc000021a error occurred after installing a specific update, you may need to uninstall it to fix the problem. To do this, you need to boot your system into Safe Mode and follow these steps:
Press the Windows key + R to open the Run dialog box.
Type appwiz.cpl and click OK to open the Programs and Features window.
Click View installed updates on the left pane.
Find and select the update that caused the error and click Uninstall.
Follow the on-screen instructions to complete the uninstallation process.
Restart your system and see if the error is resolved.
Method 3: Perform a System Restore
If none of the above methods work, you may need to perform a system restore to revert your system to a previous state before the error occurred. To do this, you need to boot your system from a Windows installation media and follow these steps:
Insert the Windows installation media into your system and restart it.
Press any key when prompted to boot from the media.
Select your language, time, keyboard, and click Next.
Click Repair your computer on the lower-left corner of the screen.
Select Troubleshoot > Advanced options > System Restore.
Select a restore point that was created before the error occurred and click Next.
Follow the on-screen instructions to complete the system restore process.
Restart your system and see if the error is resolved.
We hope this article has helped you fix the 0Xc000021a error on your Windows Server. If you have any questions or feedback, please leave a comment below. ec8f644aee