Microsoft Windows Error Code 0xC00000A8: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC00000A8
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code 0xC00000A8, or STATUS_BAD_TOKEN_TYPE, occurs when Windows encounters a token type mismatch, often during system boot or when launching certain applications. This typically indicates a corrupt system file, misconfigured boot settings, or a problematic driver. Follow the steps below to resolve it.
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Tools You'll Need

How to Fix Error Code 0xC00000A8

  1. Boot into Safe Mode

    Back up important files if possible before proceeding.

  2. Run System File Checker (SFC)

  3. Run DISM Tool

  4. Check Boot Configuration Data (BCD)

    Ensure you have a backup of important data before modifying boot records.

  5. Perform a System Restore

    System Restore may not be available if no restore points exist.

  6. Check for Driver or Software Conflicts

    Be cautious when uninstalling drivers; only remove those you suspect.

  7. Repair or Reinstall Windows

    A clean install will erase all data on the system drive. Backup first.
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When to Call a Professional

If you are uncomfortable with command-line tools or editing system files, or if the error persists after all steps, consider contacting a professional technician. Also seek help if your data is not backed up and you need data recovery.

Frequently Asked Questions

What causes Windows error 0xC00000A8?
This error is caused by a token type mismatch, often due to corrupt system files, corrupted boot configuration data, faulty drivers, or recent software installations that conflict with system processes.
Can I fix error 0xC00000A8 without reinstalling Windows?
Yes, in most cases. Running SFC, DISM, and BCD repair commands can resolve the issue without reinstalling. System Restore or uninstalling problematic drivers/software also work. Reinstallation is a last resort.
Will I lose my data when fixing this error?
The steps listed (SFC, DISM, BCD repair, System Restore) are designed to preserve your personal files. However, a clean reinstallation will erase everything on the system drive. Always back up important data before troubleshooting.
How do I boot into Safe Mode if I can't access Windows?
Use a Windows installation media (USB/DVD). Boot from it, select your language, click 'Repair your computer', then 'Troubleshoot' > 'Advanced options' > 'Startup Settings' > 'Restart'. After restart, press 5 for Safe Mode with Networking.
What is the STATUS_BAD_TOKEN_TYPE error?
It's an error code indicating that a token (a security descriptor) used by a process or system component has an incorrect type. This prevents the process from accessing resources properly, causing boot failures or application crashes.

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