0x80070020: Windows Update error

Last checked 2026-10-31 · 5 fixes · reviewed answer

Likely causes

1. Antivirus or security software scanning and locking update filesmost likely
2. Another Windows Update or installer process already runningpossible
3. Corrupted system files blocking accessless likely

How to fix it

1. Restart your computerSafe

   Close all programs and restart Windows so any locked files are released.

2. Run the built-in Windows Update troubleshooterSafe

   Open Settings > Update & Security > Troubleshoot > Windows Update and let it scan and fix issues automatically.

3. Temporarily pause real-time protection in your antivirusChanges settings

   Open your antivirus program, turn off real-time scanning for a few minutes, then try the update again. Turn protection back on afterward.

   ⚠ Turn real-time protection back on right after the update finishes.

4. Repair Windows system filesChanges settings

   Open Command Prompt as administrator and run DISM first, then System File Checker, then retry the update.

   DISM /Online /Cleanup-Image /RestoreHealth
   sfc /scannow

5. Do a clean boot and retryChanges settings

   Run msconfig, on the Services tab tick Hide all Microsoft services and click Disable all, restart, install the update, then re-enable the services.

   msconfig

   ⚠ Remember to re-enable the services afterward.

If that didn't fix it

Download the update manually from the Microsoft Update Catalog (catalog.update.microsoft.com) using its KB number and install it directly.

When to see a technician

If the error continues after these steps, have a technician check for deeper file or disk problems.

Quick answers

What does 0x80070020: Windows Update error mean?

This error means Windows Update cannot access a needed file because another program is using it, most often an antivirus scan or a background process locking the update files.

What causes 0x80070020: Windows Update error?

Antivirus or security software scanning and locking update files. (most likely) Another Windows Update or installer process already running. (possible) Corrupted system files blocking access. (less likely)

How do I fix 0x80070020: Windows Update error?

Try these in order, safest first: 1. Restart your computer. 2. Run the built-in Windows Update troubleshooter. 3. Temporarily pause real-time protection in your antivirus. 4. Repair Windows system files. 5. Do a clean boot and retry.

What if that didn't fix it?

Download the update manually from the Microsoft Update Catalog (catalog.update.microsoft.com) using its KB number and install it directly.

When should I see a technician?

If the error continues after these steps, have a technician check for deeper file or disk problems.

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