Reddit Validated OS Error Code 0xC0000221: How to Fix It

Easy 30-60 minutes High Severity Verified June 2026
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Error Code
0xC0000221
Brand
Reddit Validated
Product Type
operating_system
Severity
High
DIY Difficulty
Easy
Estimated Fix Time
30-60 minutes
Error code 0xC0000221 indicates a bad image checksum, meaning a critical system DLL file is corrupted. This usually happens due to disk errors, malware, or improper shutdowns. The primary fix is to run System File Checker (SFC) to repair the corrupted files.
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Tools You'll Need

How to Fix Error Code 0xC0000221

  1. Run System File Checker (SFC) Scan

    Do not close the Command Prompt during the scan.

  2. Run DISM to Repair System Image

  3. Check Disk for Errors

    This may take a long time. Do not interrupt the disk check.

  4. Run a Full Antivirus Scan

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When to Call a Professional

If the error persists after these steps, you may have failing hardware (e.g., RAM or hard drive). Contact a technician for hardware diagnostics.

Frequently Asked Questions

What causes error 0xC0000221?
It's caused by corruption in a system DLL file, often due to disk errors, malware, or unexpected shutdowns.
Can I fix error 0xC0000221 without reinstalling Windows?
Yes, running SFC and DISM can often repair the corruption without reinstalling.
Does error 0xC0000221 indicate hardware failure?
Not necessarily, but if the error persists after software fixes, it could indicate failing RAM or hard drive.

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