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Fix Windows Security Sync Issues on Mac - Windows Defender Failed to Start: Manual Malware Check Guide-Fix Windows Defender High CPU and Memory Not Working

Updated 2026-06-14 14:10:44developer-tools
Fix Windows Security Sync Issues on Mac - Windows Defender Failed to Start: Manual Malware Check Guide-Fix Windows Defender High CPU and Memory Not Working
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.