Fix 'Access Denied' When Running PowerShell Scripts - How to Fix Windows Security Migration After Update-Troubleshooting Windows Defender Error 0x8007042c

Updated 2026-06-13 15:01:53macos-help
Fix 'Access Denied' When Running PowerShell Scripts - How to Fix Windows Security Migration After Update-Troubleshooting Windows Defender Error 0x8007042c
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.