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How to Reinstall Windows Security App (Microsoft Defender) - Fix Windows 11 Installation Assistant Hanging at 99 Percent-Windows 11 Taskbar Icons Missing? Fixes That Actually Work

Updated 2026-07-28 13:50:07developer-tools
How to Reinstall Windows Security App (Microsoft Defender) - Fix Windows 11 Installation Assistant Hanging at 99 Percent-Windows 11 Taskbar Icons Missing? Fixes That Actually Work
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.

More repair notes

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