Microsoft Windows Error Code 0xC0000020: How to Fix It
Easy 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- 0xC0000020
- Brand
- Microsoft Windows
- Product Type
- operating_system
- Severity
- Medium
- DIY Difficulty
- Easy
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Windows PC
- Administrator access
- Stable internet connection for updates
How to Fix Error Code 0xC0000020
-
Run System File Checker (SFC)
-
Run DISM Tool
-
Perform a Clean Boot
After testing, re-enable services to avoid long-term performance issues. -
Check for Disk Errors
Back up important data before running chkdsk, as it may cause data loss in rare cases. -
Reinstall or Update the Problematic Software
Make sure to download software only from trusted sources.
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When to Call a Professional
If none of the steps resolve the error, or if you encounter frequent system crashes, consider contacting a professional technician. This error may indicate deeper hardware issues like failing RAM or hard drive.Frequently Asked Questions
What does error code 0xC0000020 mean?
It means a file necessary for the program or system is corrupted or incompatible, preventing Windows from mapping it into memory properly.
Can error 0xC0000020 be caused by malware?
Yes, malware can corrupt system files. Run a full antivirus scan as part of troubleshooting.
Will resetting Windows fix error 0xC0000020?
A system reset that keeps your files might fix corruption, but it's a last resort. Try SFC, DISM, and chkdsk first.
Is error 0xC0000020 a hardware problem?
It's usually software-related, but failing hard drives or RAM can cause file corruption. Run hardware diagnostics if software fixes fail.
How do I prevent error 0xC0000020 in the future?
Regularly update Windows, run antivirus scans, and avoid force-shutting down your PC to prevent file corruption.