I was doing nothing on the computer when it automatically shut down on it's own. I then restarted the comp to find that every single thing on the system was changed. This has happened twice in the past 2 days. The first time this happened, I was sort of at the computer but I wasn't really looking at it but I could of sworn I saw a blue screen before it shut off. But if there was a blue screen, there should of been an error message when I fixed my system. How can I prevent this from happening again?
I have Win XP.