
How to Reset Windows Defender Settings
If Windows Defender (Microsoft Defender Antivirus) is acting up—won't open, shows error messages,...
Software troubleshooting desk

If Windows Defender (Microsoft Defender Antivirus) is acting up—won't open, shows error messages,...

You open Windows Security and see a warning that Windows Defender isn't working, often accompanie...

You sign in, see "Preparing Windows" or a spinning circle, then get dumped back to the login scre...

You search for a file or app in Windows, and nothing shows up, or you get an error like "Somethin...

You restart your PC to finish installing a Windows security update, but after the reboot, the upd...

If OneDrive stops syncing and you see errors like “Sync pending” or “We can’t sync this file,” a ...