Microsoft Windows Error Code 0x00000029: How to Fix It

Medium 2-4 hours High Severity Verified June 2026
Error Code
0x00000029
Brand
Microsoft Windows
Product Type
operating_system
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
2-4 hours
Windows error code 0x00000029, also known as SECURITY_SYSTEM, indicates corruption in the Local Security Authority (LSA) subsystem. This critical error typically triggers a blue screen of death (BSOD) and prevents Windows from starting properly, requiring immediate attention to restore system stability.
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Tools You'll Need

How to Fix Error Code 0x00000029

  1. Boot into Safe Mode

    If you cannot access Safe Mode, you may need to use Windows Recovery Environment or installation media
  2. Run System File Checker

  3. Check Disk for Errors

  4. Run DISM Repair Tool

  5. Update Windows and Drivers

  6. Perform System Restore

    System Restore may remove recently installed programs and drivers
  7. Reset Windows Security Components

  8. Check for Malware

Parts You May Need

External hard drive or USB drive
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Windows installation media
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External hard drive or USB drive
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Windows installation media
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External hard drive or USB drive
Check Price on Amazon
Windows installation media
Check Price on Amazon
External hard drive or USB drive
Check Price on Amazon
Windows installation media
Check Price on Amazon
External hard drive or USB drive
Check Price on Amazon
Windows installation media
Check Price on Amazon
External hard drive or USB drive
Check Price on Amazon
Windows installation media
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 using Command Prompt, if the computer won't boot into Safe Mode, or if you suspect hardware failure. Professional help is also recommended for business-critical systems or if you lack experience with Windows recovery procedures.

Frequently Asked Questions

What causes Windows error code 0x00000029?
Error 0x00000029 is typically caused by corruption in the Local Security Authority subsystem, often due to malware infections, failing hardware, corrupted system files, or incompatible security software conflicts.
Can I fix error 0x00000029 without losing my files?
Yes, most repair methods including System File Checker, DISM, and System Restore preserve your personal files. However, always backup important data before attempting repairs as a safety precaution.
How do I prevent error 0x00000029 from happening again?
Keep Windows updated, use reliable antivirus protection, avoid installing suspicious software, regularly run disk cleanup and defragmentation, and ensure your hardware is functioning properly with adequate cooling and power supply.
Is error 0x00000029 related to hardware problems?
While primarily a software issue, error 0x00000029 can be triggered by failing RAM, hard drive errors, or overheating components. If software fixes don't work, consider running memory diagnostics and checking hardware health.
Will reinstalling Windows fix error 0x00000029?
A clean Windows installation will resolve the error, but this should be a last resort. Try all other repair methods first, as reinstalling Windows requires backing up data and reinstalling all programs and drivers.