Error C000021a

Regardless of the Windows Operating System your PC uses you might run into an Error C000021a, also known as the Blue Screen of Death. This is never a good sign and should be addressed as soon as it occurs.

Symptoms of an Error C000021a


Whenever an Error C000021a occurs you will know it. The telltale sign is of course going to be your computer screen going all blue with a string of words and messages that you might not understand. Before you ever get to that point though, your computer will likely give you signs, like slowing down dramatically or even freezing periodically.

Causes of an Error C000021a

Unfortunately, the Error C000021is a hard error to diagnose. There are several factors that could play a role in such an error including the presence of adware, specific software problems, or even a registry that has become cluttered and corrupt over time.

Fixing an Error C000021a


Newer versions of the Windows Operating System will automatically run a check for solutions and you might get lucky enough to get one that works. However, if you can’t find the automatic solution you are looking for you can try to go about it manually.


  1. Click on the Start button.
  2. Click on Control Panel.
  3. Double Click Programs Report.
  4. Click Check for New Solutions.
  5. If solutions are available click on them and follow steps provided.
  6. Restart your computer after the application has finished making sure changes take effect.

See if the Error C000021a is still plaguing your computer.

  • Instructions
    Windows 10, Windows 7, Windows XP & 2000

    To Fix this issue you need to follow the steps below:

    Step 1:

    Download Repair Tool

    Step 2:

    Click the "Scan" button

    Step 3:

    Click 'Fix All' and you're done!

    Compatibility: Windows 10, Windows 7, Vista, XP

    Download Size: 1.5MB

    Requirements: 300 MHz Processor, 256 MB Ram, 22 MB HDD

    Limitations:trial version offers an unlimited number of scans, backup, restore of your windows registry for FREE. registration for the full version is $29.95 USD for 1-year subscription to use all the features.