How to Fix Blue Screen Error Code 0xC000021A in Windows 10/11?

thank you so very much! my computer came back using method #2. now if I could only get my chrome to work, (which is what caused the problem in the first place), I’d be all set.

I got this error after a fresh format of the HDD & a fresh install of windows 10. So every site I have found online so far, have useless info because none fit the issue I am having. And everything that I could try is not working at all. Any help would be greatly appreciated thanks

I have the error with HP workstation and nothing worked, aalos not to bbot from an USB. how shouldI than run the tool you recommend, if the laptop doesn’t access the USB. I’m not a PC freak and have no further idea. Please help

Tried and failed. Its not the boot which goes on endlessly it goes over to the repair and advanced troubleshooting instantly. No prob though im getting a new pc so ill just reset my pc and install a new installation of windows.

Can you get to Advanced Mode and do a reboot? Repeatedly interrupt the reboot 2 or 3 times, and it will auto boot into Advanced Mode. From there, do a system restore to the point when everything worked perfectly.

method#2 isnt working for my laptop. please help

How can you tell if it’s the hard drive?

you have to add the destination
copy /Y SOFTWARE C:windowssystem32config

Apologies for the delayed response. What i meant to say is that if you get a Disk Enclosure and copy the data (not clone) to another drive or computer by putting the drive from the computer in question into the enclosure and then once the data is copied, you can then do a clean install.

The problem is that the drive didn’t show up on another computer. It comes up saying it had to be formatted first which I’m not going to do unless I have a way to restore the data… The drive tested good in a DiskJockey.

Thank you for replying! What do you mean with disk enclosure…? If I “clone” the drive to another 1 TB drive, I might just have the same trouble getting the data off that drive after the reset, or? What do you suggest?

You can use a disk enclosure to copy the data first, and then do a reset.

Kevin, thanks for a great article. I’m trying to fix the 0xc000021A on a customer’s PC. I have tried all of the steps except the last one because my customer does not have a backup of their stuff…
Method #1 won’t work since I can’t connect to the drive using another PC. I have scanned the drive with a “Kangaroo” and it tested good, I have tried to connect the drive to another PC but it only gives me an error saying the drive needs to be formatted due to an unrecognizable file system (!) It’s as if the MBR records are majorly screwed up
Method #2 just comes back with the same error.
Method #3 SFC runs to 100% and gives an error like John Bateman stated below.
Method #4 did not work, same thing.
Method #5 I don’t have a backup of the registry (or anything else…) So, unless I can copy the system32config files from another pc and just cross my fingers, that won’t work either.
My customer is VERY afraid of losing their data and I’m not going to wipe the drive and re-install if there is a chance it can be saved.What in the world am I suppose to do now? Any ideas at all…?

I’d suggest you format this drive, on an other PC by connecting it to the other pc using a disk enclosure and then try installing windows, if the disk is faulty, you will know when you connect it to the other pc.

You mean, SSD is not showing up in the boot order?

My laptop only loads hp wif a black screen what can I do

@appuals:disqus Hi, I got the Blue Screen, 0xc000021a. Can not get back to my login screen anymore. (The original crash happened when logging into my profile…lagged and i rebooted and got blue screen)
Goes to basic text and says “Reboot and Select proper Boot device”
Tried option 2 to fix, didn’t work.
New blue screen with Stop Code : CRITICAL PROCESS DIED
Got back to Advanced options,
Tried going back to previous build, thank process failed.
Goes to basic text and says “Reboot and Select proper Boot device”
Go into my BIOS and now my SSD is now showing up in as a boot option, only my other hdd in Sata 2 port. Windows 10 is installed on the ssd.

I have read through most of the comments and can’t find anyone with my issues. Any advice based on my issues? Thanks.

Nothing is working. I can’t get to my log in screen. I have tried a system restore. I have tried to wipe my hard drive clear and reinstall windows. I have even just tried cleaning up my hard drive and it keeps telling me it didn’t work and no changes were made. All of this BTW from the blue screen.

Hello Kevin,
I tried method 2. Not working. Comes back to the blue screen.
How do I use method 1 or method 3? The PC does not start & hence I cannot Download and run Reimage Plus or run a full SFC scan

You will need to use another PC to download ISO and burn it onto a USB or a disc, and then change boot order from bios to boot from the media (usb or cd) and then do a reinstall. You can use the license keys you have to activate once it is installed.