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Fix Windows Security Service Not Starting - Windows Defender Setup Stuck: File Locked Error Fix-Fixing Microsoft Teams Error 80070005: Permission Denied

Updated 2026-06-18 17:23:21security-tools
Fix Windows Security Service Not Starting - Windows Defender Setup Stuck: File Locked Error Fix-Fixing Microsoft Teams Error 80070005: Permission Denied
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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