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Are you dealing with the error code 0xc000021a on your Windows machine?
If yes, you have stumbled upon the right webpage.
In most conditions, these BSOD errors restrict you from accessing your Windows OS.
Therefore, resolving these errors becomes very important and a bit challenging.
The same happens with the stop code 0xc000021a error on Windows.
This guide also covers information about this error, why it occurs, and ways to prevent it.
So, without any further ado, lets get started
What is the stop code 0xc000021a error?
Stop code 0xc000021a is a BSOD error.
In all the scenarios, this error means that the system security cannot be guaranteed.
Therefore, Windows OS is shifting you to the kernel mode and showing BSOD.
While it may be the case for you, this notion isnt entirely true.
This error has been around for quite a long time and has affected several other Windows versions.
Were just collecting some error info, and then you could restart.
And you have to follow the same approach to fix it.
What causes the error code 0xc000021a on Windows?
you could, however, try a hard reboot to see if that helps you to load your OS.
But if the boot loop repeats, the hard reboot will not work.
However, reaching WinRE is a bit challenging if your PC isnt booting up.
Thats because BSOD restricts you from doing anything on your box.
To reach WinRE, you have to rely on hard reboots.
For this, you have to hard reboot your Windows machine three to four times within a few minutes.
You will see Preparing Automatic Repair on your screen.
Once it loads, you have to tap on theAdvanced Optionsbutton.
Only after that, you’re able to apply fixes.
To load WinRE, you might follow the aforementioned steps.
After WinRE loads, you’re able to take these actions to enable Safe Mode
Thats it.
This will boot you in Safe Mode.
Therefore, unplugging them from your PC should be the topmost method to see if that helps.
You dont need to boot into Safe Mode for this method, though.
Unplug all the external devices connected to your box and restart it.
If the error gets fixed, connect each machine one by one to see which one is the culprit.
But if the error still exists, follow the next method.
Running theSFC scancould help you repair the corrupted files and hard drive sectors.
As a result, this BSOD error will get fixed.
The good thing is that running an SFC scan is like a cakewalk.
Here is how you could run an SFC scan
This will run theDeployment Image Servicing and Management.
It is essential and recommended to run DISM before usingSystem File Checker.
This will launch theSystem File Checkerutility and process the automatic repair.
The scan may take a while, so keep patience and dont close theCommand Prompt.
Now, power cycle your box and see if you are still facing the 0xc000021a error on Windows.
If yes, try the next workaround.
In such a scenario, reverting pending actions can be a great solution to fix this error.
To revert pending actions, you gotta boot into the Windows Recovery Environment.
We have already covered how you could reach WinRE above.
Wait for the command to execute successfully.
Then, attempt to boot into Windows normally to test whether the error still persists.
If it does, follow the next workaround.
After that, if you want, it’s possible for you to again drop in the updates.
This method, again, can be followed either from Safe Mode or WinRE.
Your PC will automatically restart after the restoring process completes.
In case it doesnt, reset your PC on your own and check whether the error has been fixed.
Do note that even though System Restore is a very convenient Windows utility, it is disabled by default.
In that scenario, this workaround will not work for you.
Therefore, rebuilding the Boot Configuration Data could be a great workaround to fix the 0xc000021a error.
After that, cycle your PC to see if the error has been fixed.
In case you still see the error, follow the next workaround.
Therefore, you should run a thorough virus scan.
Here is how you could run Windows Defender antivirus to fix this error
Thats it.
Windows Defender will start scanning your drives thoroughly for any viruses and malware.
If Windows Defender finds any threats on your PC, Defender will put that on a list.
Once all the threats have been fixed, reboot your PC to check whether the error still exists.
Therefore, you should uninstall these programs to see if that helps you fix this BSOD error.
If it isnt, follow the next workaround.
If you still see the BSOD error code 0xc000021a, follow the next workaround.
Here is how you could fix driver-related issues
Doing so will automatically initiate the driver update process.
If the driver updater cant find any related drivers, you could try theDisable DeviceorUninstall Deviceoption.
However, disabling/uninstalling will stop that machine immediately.
You will have to roll out the gear drivers again to make that gear work again.
If that may be the case, disabling Driver Signature Enforcement would surely fix the error for you.
Here is how it’s possible for you to do that
After this, your system will reboot automatically.
In case it doesnt, simply reboot your PC manually and check whether the issue has been resolved.
Therefore, restoring system registry entries to default can be a great solution to fix this error.
Keep in mind that two dots are included in the commands.
However, keep in mind that Windows reset would erase all the installed programs and prefs.
Windows reset would basically reset everything to the factory default state.
Windows, however, gives you an option if you want to keep your personal files.
Here is how you might reset your Windows
Thats it.
Resetting your PC is the sure shot solution to fix this error code 0xc000021a.
However, this will erase all the app installations, data, and controls.
BSOD errors are difficult to deal with because they restrict you from booting Windows OS.
Hopefully, the aforementioned workarounds have helped you fix this error on your Windows machine.
Next, you may also read how to fix d3dx9_43.dll Not Found/Missing error on Windows.
