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Fix Windows Defender Access Denied Error on Startup - Real-Time Protection Won't Turn On in Windows Security-Fix High Memory Usage After Windows Update

Updated 2026-06-13 14:31:18windows-fixes
Fix Windows Defender Access Denied Error on Startup - Real-Time Protection Won't Turn On in Windows Security-Fix High Memory Usage After Windows 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.