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Fix Windows Update 404 Not Found Using Command Prompt - Scheduled Task Not Running Due to Logon Failure-Windows Defender Update Fails with Code 0x80070643

Updated 2026-06-13 20:10:04cloud-software
Fix Windows Update 404 Not Found Using Command Prompt - Scheduled Task Not Running Due to Logon Failure-Windows Defender Update Fails with Code 0x80070643
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.

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