How to Fix Stop Code 0xc00021a?

A stop code 0xc00021a is an error that occurs when Windows is unable to read data from the registry. This can be caused by a number of things, including a corrupt registry, a virus, or a hardware issue. In most cases, this error can be fixed by running a registry cleaner or by manually fixing the registry. If the problem persists, it may be necessary to reinstall Windows.

You are here because you have a question about:

• error code 0xc00021a
• stop code 0xc00021a

• Restart your computer
• Run the Windows Memory Diagnostic Tool
• Run a virus scan
• Run the System File Checker
• Run the DISM tool

1. Restart your computer

1. Click on the "Start" button
2. Type "cmd" in the search bar and press Enter
3. Type "restart" and press Enter
4. Type "reboot" and press Enter

2. Run the Windows Memory Diagnostic Tool

1. Open the Windows Memory Diagnostic Tool by typing "memtest.exe" into the Start menu and selecting it.
2. Click the "Start test" button.
3. The tool will start running and will display a screen that shows the current status of the test.
4. If the test is successful, the tool will indicate this by displaying the message "Passed". If the test is not successful, the tool will indicate this by displaying the message "Failed".
5. In order to fix the stop code, you will need to identify the cause of the problem and then fix it.

3. Run a virus scan

1. Open the "Start" menu, select "Run," type "cmd" and press Enter.
2. At the command prompt, type "scanstate" and press Enter.
3. At the scanstate prompt, type "scannow" and press Enter.
4. If the scan shows any problems, follow the instructions that appear to fix the problem.

4. Run the System File Checker

1. Open the Command Prompt and navigate to the folder where the Windows operating system is installed.
2. Type "systemfilechecker" and press Enter.
3. The System File Checker window will open.
4. Click the "Scan" button.
5. The System File Checker will scan the Windows operating system for missing, corrupt, and damaged files.
6. If the scan finds any missing, corrupt, or damaged files, the System File Checker will display a list of the files and the corresponding stop code.
7. To fix the stop code, you will need to restore the missing, corrupt, or damaged files. You can do this by using the "Repair" button or by using the Windows "File Manager" application.

5. Run the DISM tool

1. Open the Command Prompt as administrator.
2. Type the following command and press Enter: Dism /Online /Cleanup-Image /StartComponentCleanup
3. Type the following command and press Enter: Dism /Online /Cleanup-Image /RestoreHealth
4. Type the following command and press Enter: Dism /Online /Cleanup-Image /CheckHealth
5. If the stop code 0xc00021a1 is not fixed, repeat steps 2-4.

If the answers above didn't work then you should also try:

1. Check your computer's security software
2. Perform a clean boot
3. Update your drivers
4. Restore your system