Fix 'Access Denied' When Running PowerShell Scripts - Windows Activation Service Unavailable on New Computer-Fix Windows Defender by Resetting Service Defaults

Updated 2026-06-14 08:42:58security-tools
Fix 'Access Denied' When Running PowerShell Scripts - Windows Activation Service Unavailable on New Computer-Fix Windows Defender by Resetting Service Defaults
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.