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Fix Microsoft Store Not Opening After Offline Installer - Troubleshoot Windows Defender Real-Time Protection Authentication Error-Resolve Error 0x8007007b in Windows Activation

Updated 2026-06-15 22:28:22office-tools
Fix Microsoft Store Not Opening After Offline Installer - Troubleshoot Windows Defender Real-Time Protection Authentication Error-Resolve Error 0x8007007b in Windows Activation
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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