Forum Discussion
Windows Virus and Threat Protection service won't start – any way to fix it?
I never turned it off as far as I remember, and even if I did, I should be able to turn it back on—but nothing's working. The service just won't start. I've tried restarting, checking services.msc, a...
Even if you don't remember installing one, check for leftover security software. Windows Defender automatically disables itself when it detects another antivirus program, and sometimes the uninstall doesn't fully clean up.