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Windows Defender 404 Not Found: How to Fix Missing Interface - How to Fix 0x80070422 in Windows Defender-Windows Update 0x80070422 Service Unavailable Fix

Updated 2026-06-18 14:09:01security-tools
Windows Defender 404 Not Found: How to Fix Missing Interface - How to Fix 0x80070422 in Windows Defender-Windows Update 0x80070422 Service Unavailable Fix
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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