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Fix Windows Defender File Locked During Scan - Windows Defender Service Error 577: Causes and Solutions-How to Resolve Windows Defender Update Authentication Failure

Updated 2026-06-13 14:21:07browser-issues
Fix Windows Defender File Locked During Scan - Windows Defender Service Error 577: Causes and Solutions-How to Resolve Windows Defender Update Authentication Failure
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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