Microsoft Windows HRESULT Error Code 0x80070021: How to Fix It

Easy 15-30 minutes Medium Severity Verified June 2026
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Error Code
0x80070021
Brand
Microsoft Windows
Product Type
hresult
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
15-30 minutes
Error 0x80070021 means Windows cannot access a file because another program is using it (lock violation). This often happens during installations, updates, or file operations. Follow these steps to resolve the conflict.
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How to Fix Error Code 0x80070021

  1. Restart Your Computer

  2. Close All Programs

  3. Disable Third-Party Antivirus Temporarily

    Disabling antivirus may expose your system to threats. Do this only temporarily and ensure you re-enable it immediately after testing.

  4. Run System File Checker

  5. Check Disk for Errors

    Backup important data before running chkdsk to prevent data loss in rare cases.

  6. Perform a Clean Boot

    After testing, re-enable services via msconfig to restore normal functionality.

  7. Reinstall the Affected Program

    Backup any app data before uninstalling.
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When to Call a Professional

If none of these steps work, the issue may be due to deeper system corruption or hardware failure. Consider contacting a professional technician or Microsoft Support.

Frequently Asked Questions

What causes error 0x80070021 in Windows?
This error occurs when a file is locked by another process, preventing access. Common causes include antivirus scanning, file in use by another program, or system file corruption.
Can I fix 0x80070021 without restarting?
Yes, try closing all programs and disabling antivirus first. If that fails, a restart is often the simplest fix.
Is error 0x80070021 dangerous?
No, it's a file access conflict and not a sign of malware. However, persistent errors may indicate system issues.
Will a clean boot delete my files?
No, a clean boot only disables non-essential services and startup programs. Your personal files remain intact.
What if error 0x80070021 appears during Windows Update?
Try running the Windows Update Troubleshooter in Settings > Update & Security > Troubleshoot, or reset Windows Update components via command prompt.

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