0xC000021a – Fix for Windows XP, Vista, 7, 8, 8.1, 10.


The 0xC000021a error is a Blue Screen of Death or BSOD error that occurs when a Windows user-mode subsystem is compromised. The error also says that your PC ran into a problem and needs to restart. This error appears every time you restart your machine, you cannot boot your machine to the windows 10 desktop.

The error message that can appear on your screen is usually this:

STOP: c000021a {Fatal System Error}
The Windows Subsystem system process terminated unexpectedly with a status of 0cx000021a.
The system has been shut down.

Cause of this error:

  1. Misconfigured software or driver:

    The most common cause of this error is a certain key piece of software or system driver that is malfunctioning.

  2. System registry is damaged:

    Another possible cause for this error is damaged system registry. This may happen because of disk read/write errors, power outages or virus attacks.

  3. How to easily fix 0cx000021a BSOD error on windows 10.

    Method 1: Clean Boot
    Step 1: Go to Desktop and click Start
    Step 2: Press the Windows + R keys to open the Run dialog box.
    Step 3: Type msconfig and press enter.


    Step 4: Go to the General tab, at the System Configuration window.


    Step 5: Click Selective start-up.


    Step 6: Uncheck Load start-up items.


    Step 7: Go to Services tab


    Step 8: Check Hide all Microsoft services.
    Step 9: Click Disable all from the bottom right


    Step 10: Go to Start-up tab
    Step 11: Disable all services listed there by doing: right-click on each and then click Disable. Now Restart your computer.
    Method 2: Your BSOD related issue can also be resolved by Advance System repair tool.

    3 Steps to Fix this Error

    Step 1. Download Advanced
    System Repair Tool
    [File Size: 15.7 MB]
    Step 2. SCAN your Windows PC
    Step 3. Click Fix button to Repair Error


    Method 3: Run SFC scan now.
    Step 1: Press windows + R key to open Run dialog box.
    Step 2: Type cmd and run it as admin.


    Step 3: And type the command sfc/scannow to repair corrupt system files > press Enter.


    Step 4: At last your issue will be resolved.
    Method 4: Running a DISM Scan.
    Step 1: Open your Command prompt and run it as Admin.
    Step 2: Inside Command Prompt, type “DISM /Online /Cleanup-Image /Restore Health”


    Step 3: Press Enter on your keyboard to run the command.

    Now restart your computer to check whether your issue has been resolved or not.


    In the above given article you can find various methods to fix BSOD 0cx000021a error for windows 10. Here I have given information about BSOD (Blue screen of death) error code 0cx000021a, its causes and fixes.

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