Microsoft Windows Error Code 0xC0000003: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC0000003
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error 0xC0000003, also known as STATUS_INVALID_INFO_CLASS, means Windows received a system call with an invalid class identifier. This can occur due to corrupted system files, outdated drivers, or problematic Windows updates. Follow the steps below to resolve it.
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Tools You'll Need

How to Fix Error Code 0xC0000003

  1. Run System File Checker (SFC)

    Do not close the Command Prompt window during the scan.

  2. Run DISM Tool

  3. Perform a Clean Boot

  4. Update Device Drivers

    Back up important data before updating drivers.

  5. Uninstall Recent Windows Updates

  6. Run a System Restore

    System Restore does not affect personal files, but it removes programs and drivers installed after that point.
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When to Call a Professional

If the error persists after trying all steps, it may indicate deeper system corruption. Contact a professional technician or consider reinstalling Windows.

Frequently Asked Questions

What causes error 0xC0000003 on Windows?
It's usually caused by corrupted system files, outdated drivers, or problematic Windows updates. It can also be triggered by third-party software conflicts.
Can I fix 0xC0000003 without losing files?
Yes, the steps above (SFC, DISM, clean boot, etc.) do not delete personal data. Only a full reinstall would remove files, which you can back up first.
Is error 0xC0000003 a virus?
No, it's a system error, not a virus. However, malware could cause corruption, so running a virus scan is recommended.
Does error 0xC0000003 appear in safe mode?
It might or might not. If it doesn't, a third-party driver or service is likely the cause. Use clean boot to isolate it.
Will resetting Windows fix error 0xC0000003?
Yes, resetting Windows (keeping files) often resolves persistent system errors. Go to Settings > Update & Security > Recovery > Reset this PC.

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