Microsoft Windows Error Code 0xC0000027: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
0xC0000027
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code 0xC0000027 indicates a problem with exception unwinding in the Windows operating system, often caused by corrupted system files, faulty drivers, or malware. This guide provides steps to diagnose and fix the issue.
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Tools You'll Need

How to Fix Error Code 0xC0000027

  1. Boot into Safe Mode

    If Windows fails to boot normally, use a Windows installation media to access recovery options.

  2. Run System File Checker

  3. Check for Disk Errors

    This process can take a long time depending on your disk size. Do not interrupt it.

  4. Update or Roll Back Drivers

  5. Perform a Clean Boot

    This disables non-Microsoft services and startup programs. Re-enable them later to identify the culprit.

  6. Run a Malware Scan

    Ensure your antivirus definitions are up to date before scanning.

  7. Restore System to a Previous Point

    This will not affect your personal files, but it will remove recently installed programs and drivers.

  8. Reset or Reinstall Windows

    Back up your important data before resetting. This will reinstall Windows and may remove some apps.
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When to Call a Professional

If you cannot boot into Safe Mode or run system file checks, or if the error persists after resetting Windows, consider contacting a professional technician or Microsoft Support.

Frequently Asked Questions

What causes error 0xC0000027?
It is typically caused by corrupted system files, outdated or faulty drivers, malware, or disk errors.
Can I fix error 0xC0000027 without reinstalling Windows?
Yes, try running SFC and CHKDSK, updating drivers, performing a clean boot, or using System Restore first. Reinstallation is a last resort.
How long does it take to fix error 0xC0000027?
Fixes can take 30 minutes to a few hours, depending on the cause and method. Disk checks and scans take the longest.
Will I lose data by fixing error 0xC0000027?
Most fixes (SFC, CHKDSK, driver updates, clean boot) do not affect your personal files. System Restore may remove some apps but preserves files. Only a full reset will remove your data if you choose 'Remove everything'.
What if Safe Mode also shows error 0xC0000027?
If the error appears in Safe Mode, the issue might be hardware-related. Try booting from a Windows installation media and running recovery tools from there.

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