Microsoft Windows Error Code 0xC00000A4: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC00000A4
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code 0xC00000A4, also known as STATUS_INVALID_GROUP_ATTRIBUTES, means Windows encountered a problem with group attributes during a system operation. This can happen after a failed update, corrupted system files, or a faulty driver. The error often appears on a blue screen and may cause your PC to restart.
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Tools You'll Need

How to Fix Error Code 0xC00000A4

  1. Restart Your Computer

  2. Boot into Safe Mode

    If you have important files, back them up before proceeding.

  3. Run System File Checker (SFC) and DISM

  4. Update or Roll Back Drivers

  5. Uninstall Recent Windows Updates

  6. Perform a System Restore

    This will undo recent system changes but won't affect personal files.

  7. Reset or Reinstall Windows

    Back up all important data before resetting or reinstalling.
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When to Call a Professional

If you are unable to boot into Safe Mode, or if the error persists after trying all steps, consider consulting a professional technician. Data recovery services may be needed if you cannot access your files.

Frequently Asked Questions

What causes Windows error 0xC00000A4?
This error is typically caused by corrupted system files, faulty drivers, or a failed Windows update. It can also occur after malware infection or hardware issues.
Can I fix error 0xC00000A4 without losing data?
Yes. Most solutions, like Safe Mode, SFC, DISM, driver rollback, and system restore, can fix the error without affecting your personal files. Resetting Windows with 'Keep my files' also preserves data.
How do I boot into Safe Mode if I can't get to the desktop?
Force shutdown your PC 3 times during boot to trigger Automatic Repair. Then go to Advanced options > Troubleshoot > Advanced options > Startup Settings > Restart. After restart, press 4 or F4 to enter Safe Mode.
Is error 0xC00000A4 a sign of hardware failure?
It's usually software-related, but in rare cases, failing RAM or a hard drive can cause this error. If software fixes don't work, run a memory diagnostic (Windows Memory Diagnostic) and check your hard drive with CHKDSK.
Do I need to reinstall Windows to fix error 0xC00000A4?
Only as a last resort. Try all other steps first, including system restore and SFC/DISM. Reinstalling Windows should fix the error but will erase your data if you choose 'Remove everything'.

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