Can anyone think of a reason why Windows XP should repeatedly and suddenly shut itself down at random? It has been doing it to me all evening, sometimes almost as soon as I boot up, and sometimes after I have been online for a while, looking at my e-mail and Friends Lists. It does it particularly if I run Spybot Search and Destroy and does it just as Spybot is about to fix problems. It did this even when I ran Spybot while Windows was in Safe Mode.
I need to stress that this is a full Windows shutdown with saved settings, not just my machine closing down.