How to Fix Error 0xc000021a in Windows 8 & 10

Heather November 30, 2018

The recent versions of Windows like Windows 8 and Windows 10 have done a lot to reverse the impression of Microsoft operating systems as being crash-prone, but even these newer and much more stable operating systems can still crash. One particularly annoying Windows error is error number 0xc000021A.

How to Fix Error 0xc000021a in Windows 8 & 10

This error message is one of the errors that means Windows itself has crashed, and your computer needs to restart. If you get this error, a big blue screen appears, telling you it’s collecting some error information and will then restart your computer for you. In small print under that, it gives the error code, 0xc000021A, and tells you that you can find out more information about the error online.

Don’t panic! This error can be corrected so it won’t recur to bother you again. It’s most common for this error to occur after a Windows update.

Repair Windows Yourself

Since your Windows computer isn’t functioning normally, you’ll have to boot Windows manually.

To do that, hold down the “Shift” key on your keyboard while you select “Restart” from the power options for Windows. You may need to use a bootable Windows disc or bootable Windows USB drive if you can’t access the “Restart” function.

A blue option screen should load that says, “Choose an option.” Select “Troubleshoot.”
In the Troubleshoot screen, select “Advanced Options.”
Next, in Advanced Options, select “Startup Settings.”
On the Startup Settings Screen,select “Disable driver signature enforcement” by pressing “F7” on your keyboard.
Press “Enter” on your keyboard or the “Restart” button if one’s displayed.

Your computer will restart the way you’ve told it to. You can adjust your computer by using the different selections offered until you find the one that works for you.

Let Windows Repair Itself

Alternatively, you can choose the “Startup repair option,” where Windows automatically scans your computer to locate the problem.

Hold down the “Shift” key on your keyboard while you select “Restart” from the power options for Windows. You may need to use a bootable Windows disc or bootable Windows USB drive if you can’t access the “Restart” function.

A blue option screen should load that says, “Choose an option.” Select “Troubleshoot.”
In the Troubleshoot screen, select “Advanced Options.”
Next, select “Startup Repair,” which scans and tries repairing your computer automatically.

Hopefully, Windows has found and repaired the problem that was causing your computer not to boot correctly.

Files That Cause Error “0xc000021A”

The two files that are responsible for the “0Xc000021A” error are “winlogon.exe” and “csrss.exe.” The first file is in charge of logging in and out of Windows, as the name suggests. The second file is a Windows server or client file. If either of these two files gets damaged or corrupted, the error can occur.

Windows can repair corrupted files and find missing files, but it can’t repair and fix hardware issues.

I hope this helped you resolve your Windows logon error without having to resort to resort to doing a clean install of Windows 8 or 10.

If you have found other ways to resolve this error, please let us know in the comments!