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How to Fix Windows Security Update Failed Errors - Fix Microsoft Store Not Opening or Crashing-Windows Store Error 0x80073cf9: Step-by-Step Fix Checklist

Updated 2026-06-14 01:15:40office-tools
How to Fix Windows Security Update Failed Errors - Fix Microsoft Store Not Opening or Crashing-Windows Store Error 0x80073cf9: Step-by-Step Fix Checklist
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.