Microsoft Windows Error Code 0xC00000A5: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC00000A5
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error 0xC00000A5 is a Windows error that means 'STATUS_BAD_IMPERSONATION_LEVEL.' It usually occurs when a program or service tries to use a security token with an incorrect impersonation level. This can happen during software updates, driver installations, or running certain applications. The good news is you can often fix it with a few system checks and repairs.
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Tools You'll Need

How to Fix Error Code 0xC00000A5

  1. Run System File Checker (SFC)

  2. Use DISM Tool

  3. Check for Windows Updates

  4. Perform a Clean Boot

    Back up your data before making system changes.

  5. Uninstall Recent Software or Drivers

  6. Run Windows Memory Diagnostic

    Save your work before restarting.
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When to Call a Professional

If all steps fail and you suspect hardware issues (like faulty RAM or hard drive), consider taking your PC to a professional technician. They can run advanced diagnostics and replace components if needed.

Frequently Asked Questions

What causes Windows error 0xC00000A5?
This error usually occurs due to corruption in system files, problematic drivers, or software that incorrectly uses Windows security tokens. It can also be triggered by recent updates or hardware issues.
Can I fix error 0xC00000A5 without reinstalling Windows?
Yes, most causes can be fixed with system tools like SFC and DISM, clean boot, or uninstalling problematic software. Reinstalling Windows is a last resort.
Is error 0xC00000A5 a virus?
No, it's a Windows system error. However, malware can cause system corruption that triggers this error. Running a full antivirus scan is recommended if other steps don't work.
Will a system restore fix this error?
Yes, if you have a restore point from before the error started, you can use System Restore to revert your system settings and potentially fix the issue.
How do I prevent error 0xC00000A5 in the future?
Keep Windows and drivers updated, avoid installing untrusted software, and regularly run SFC and DISM scans to maintain system health.

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