Microsoft Windows Error Code 0x00000039: How to Fix It

Medium 1-3 hours High Severity Verified June 2026
Error Code
0x00000039
Brand
Microsoft Windows
Product Type
operating_system
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
1-3 hours
Error code 0x00000039 (SYSTEM_EXIT_OWNED_MUTEX) is a critical Windows blue screen error that occurs when a system thread exits while still owning a mutex lock, typically caused by faulty drivers or hardware issues. This error prevents Windows from starting properly and requires immediate attention to restore system stability.
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Tools You'll Need

How to Fix Error Code 0x00000039

  1. Boot into Safe Mode

    If your computer won't boot at all, you may need to use a Windows installation disc or USB to access recovery options.
  2. Check Recent Hardware or Software Changes

  3. Update or Rollback Problematic Drivers

    Always download drivers from official manufacturer websites to avoid malware.
  4. Run System File Checker

  5. Check for Memory Issues

    Memory tests can take several hours to complete. Ensure your computer won't be interrupted during testing.
  6. Disable Recently Installed Software

  7. Perform System Restore

    System Restore will uninstall programs installed after the restore point date.
  8. Check Hardware Connections

    Always unplug the power cord and ground yourself before touching internal components to prevent electrical damage.

Parts You May Need

RAM memory modules
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Hard drive or SSD
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RAM memory modules
Check Price on Amazon
Hard drive or SSD
Check Price on Amazon
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When to Call a Professional

Contact a computer technician if the error persists after trying all steps, if you're uncomfortable opening the computer case, or if memory tests reveal hardware failures. Professional diagnosis may be needed for complex driver conflicts or hardware incompatibilities.

Frequently Asked Questions

What causes Windows error 0x00000039?
Error 0x00000039 is caused by a system thread exiting while still owning a mutex lock, typically due to faulty drivers, incompatible hardware, corrupted system files, or memory issues.
Can I fix 0x00000039 without losing my files?
Yes, most solutions preserve your personal files. System Restore, driver updates, and system file repairs don't affect documents, photos, or other personal data.
How do I prevent 0x00000039 errors in the future?
Keep drivers updated, avoid installing questionable software, regularly run system maintenance, and ensure proper hardware installation. Use Windows Update and manufacturer websites for driver updates.
Is 0x00000039 a serious error?
Yes, this is a critical system error that causes blue screens and prevents Windows from functioning properly. It requires immediate attention but is usually fixable with proper troubleshooting.