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Fix 'Port Already Allocated' Error When Microsoft Store Won't Open - Troubleshooting Windows Defender Service Failure-Fix PowerShell Blank Screen After Windows 10 Update

Updated 2026-06-14 03:22:16browser-issues
Fix 'Port Already Allocated' Error When Microsoft Store Won't Open - Troubleshooting Windows Defender Service Failure-Fix PowerShell Blank Screen After Windows 10 Update
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.