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Fix 'Windows Defender Failed to Start Due to Group Policy' Error - Troubleshoot Windows Defender DNS Resolution Failure-Fix Slow Windows Update Downloads on Mac via Boot Camp or VM

Updated 2026-06-13 14:11:38developer-tools
Fix 'Windows Defender Failed to Start Due to Group Policy' Error - Troubleshoot Windows Defender DNS Resolution Failure-Fix Slow Windows Update Downloads on Mac via Boot Camp or VM
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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