This article is part of a continuing series on Blue Screen of Death errors. A Blue Screen of Death (BSoD) is the error screen you see when Windows has a major issue. It halts the PC and displays some very important information.
Depending on the error message you get, the steps you need to take are different.
This error may also appear with only a few lines of text and the error code 0xC000021A, as in the screenshot.
This one happens as a result of an error in a critical user-mode subsystem. What that means is that it could be one of three things: your device drivers need updated, your PC needs scanned for viruses, or your hard disk needs scanned for errors.
That’s where Driver Reviver comes in. With a single scan, it can update all the drivers on your PC at once, and will even back up your existing drivers and create a Restore Point for you. Driver Reviver specializes in clearing up system errors due to old or incorrect drivers. Give it a try.
This error could be caused by a virus. If so, you’re going to want to run a reputable virus scanner, such as Malwarebytes Anti-Malware, that can scan the MBR and eliminate the problem. Here’s our guide to escaping a virus attack.
A corrupted hard drive might be causing this BSoD. To check the hard drive for errors:
Here’s a page on Microsoft’s website about this specific BSoD error. It’s pretty technical, but worth checking out if the above solutions don’t work.
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