Fix Windows Update Error 0x80070002: Step-by-Step Repair Guide - Fix Windows Defender Error 0x80073b01 (Crash on Startup)-Troubleshoot WireGuard Handshake Failure

Updated 2026-06-16 00:07:11macos-help
Fix Windows Update Error 0x80070002: Step-by-Step Repair Guide - Fix Windows Defender Error 0x80073b01 (Crash on Startup)-Troubleshoot WireGuard Handshake Failure
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.