I was just browsing around when at once I got messages that UAC, windows defender, Avast, etc. got turned off, without me doing anything. Then my PC turned by itself. I'm now running virus scans and I checked my eventlogs, but found nothing yet.
Windows Update also failed to install a new definition after I rebooted.
Any idea what this could've been?
EDIT: Forgot to mention that everything was turned on again after rebooting. I have since the reboot got nothing abnormal.