today I upgraded from athlon xp to a64(reformatted and installed XP home) and twice in the past 20 minutes I've got this message followed by my computer restarting, it's pretty annoying and I wouldn't doubt if it keeps happening.
http://img335.imageshack.us/img335/7253/shutdown41525gv.gif
http://img335.imageshack.us/img335/7253/shutdown41525gv.gif