zhizhu
Home / / How to Fix Windows Defender Crashing on Windows 11 - Windows Security Not Opening After Update – Fixes-Troubleshoot Windows Security Startup Failure

How to Fix Windows Defender Crashing on Windows 11 - Windows Security Not Opening After Update – Fixes-Troubleshoot Windows Security Startup Failure

2026-06-13 14:03:18
How to Fix Windows Defender Crashing on Windows 11 - Windows Security Not Opening After Update – Fixes-Troubleshoot Windows Security Startup Failure

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.