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Fix Windows Defender Update Error 0x80240034 - How to Fix Windows Defender Version Mismatch on Windows 10-Troubleshoot Microsoft Store Not Opening After Update

Updated 2026-06-13 14:29:26office-tools
Fix Windows Defender Update Error 0x80240034 - How to Fix Windows Defender Version Mismatch on Windows 10-Troubleshoot Microsoft Store Not Opening After 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.

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