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Error 0xc000021a or also known as blue screen error on Windows 10 is truly a nightmare for anyone using Windows, not just Windows 10. Microsoft has also explained error 0xc000021a can be caused by various factors, partly due to disk partition issues, faulty hard drives, or some causes during use, and the appearance of blue screen errors preventing access to your Windows 10.
Usually, with other blue screen errors, you just need to restart your computer and then find out the cause caused by which software. However, with error 0xc000021a on Windows 10 which makes it much more severe, you cannot access Windows 10 much more seriously. Before deciding to reinstall Win 10 or reset Windows 10, you should try the method below by Mytour to proceed with fixing 0xc000021a error on Windows 10.
Guide to Fixing 0xc000021a Error on Windows 10, Resolving Blue Screen Issue
If you can normally access Windows, entering Advanced Options to restore is quite simple with the shortcut Ctrl + Alt Del to display the screen as shown below.
Then, holding Shift and clicking Restart will do.
However, in more severe cases as mentioned by Mytour above, which is also the focus of this article, when you cannot access Windows, we will have to find another way. There are 2 ways to access Advanced Options to fix the 0xc000021a error on Windows 10.
- You can create a Windows PE, a mini Win form that helps you access Windows 10 fastest, then apply the method to access advanced Options as mentioned by Mytour, refer to the article guiding how to create Windows PE and follow the instructions to get in.
- Another way is to refer to another article by Mytour, with 5 ways to access Advanced Options will give you more options in case you are not eligible to follow the above method, see how to access Advanced Option Windows 10 here.
Step 1: After accessing Repair if you do one of the 2 ways Mytour suggested above, continue to choose Choose an Option >Troubleshoot .
Step 2: Click select Advanced options .
Step 3: Within the Advanced Options section, there are 6 choices to customize with your Windows 10, to fix the 0xc000021a error on Windows 10, select Command Prompt .
Step 4: The system will restart and automatically bring you to Command Prompt after logging into your computer account .
Step 5: Enter the correct computer password and then Continue to proceed.
Immediately after completing the login step, the Command Prompt screen interface will appear.
Step 6: In Command Prompt, type the command sfc/ Scannow to scan the entire machine.
Step 7: Right after scanning the machine, if no errors are detected, continue typing dism /online / cleanup-image /restorehealth to proceed with restoring Windows 10.
After this process, restart your machine to see if you've successfully accessed Windows 10 again. In this way, the 0xc000021a error on Windows 10 has been resolved.
Guide to fixing 0xc000021a error on Windows 10 by setting up a new configuration.
If applying the above method is unsuccessful and you still can't access your Windows 10, then follow the steps below.
Step 1: Continue to access Command Prompt as instructed above and then type the command dir .
Step 2: After typing dir, proceed to create Config using the command cd Windowssystem32config
Step 3: After creating, continue to type dir .
If the Config section contains files like SAM, Security, Software, System, Journal, Regback, it means you have successfully created it.
Step 4: The next step is to create another new Regback file, type the command copy . registry.old
Step 5: Then type cd regback and dir .
Step 6: Continue to type Copy . to copy the items in Regback.
Step 7: After completing this step, type the command Exit and restart your machine.
Choose Continue to restart the machine, and then check if you've accessed Windows 10.
Following Mytour's instructions on the two methods above will help you fix the 0xc000021a error on Windows 10, hopefully allowing you to reopen Windows 10 normally to avoid reinstalling. Additionally, during the use of Windows 10, if you encounter error messages related to Class Not Registered Windows 10, a common error for those using this operating system. To thoroughly fix it, you need to refer to the article on fixing Class Not Registered error on Windows 10.
On Windows 10, there are many causes of blue screen errors, in addition to the 0xc000021a error, the BAD POOL CALLER error is also one of the blue screen errors that makes users uncomfortable. If you encounter this error, refer to the fix for BAD POOL CALLER error to resolve it.
