Very odd indeed
I am using Win 7 Premium and was busy filling an on-line application for a credit card, had two explorer windows open and was backing up a single file to my server when I got the message "Windows will log you off in 1 minute" appear on the screen....which it did and shut down my machine.
I also had a "Handbrake" compression session interrupted before finishing today while at work.
Searching for possible reasons gives little help. I have run a malaware session and it found nothing.
Can anyone help with what is the likely cause?