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Fix Windows Defender Threat Service Stopped Startup Type Error - How to Fix Store Error 0x80073cf9 Sync Problems-How to Fix Windows Security Service Not Running

Updated 2026-06-13 14:33:24browser-issues
Fix Windows Defender Threat Service Stopped Startup Type Error - How to Fix Store Error 0x80073cf9 Sync Problems-How to Fix Windows Security Service Not Running
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.