I wrote a similar problem a few months back concerning Windows XP always restarting when I go into it through bootcamp. Now Vista is doing the same, its crazy! Basically, in short, I startup windows, everythings fine till I get to my desktop. Everything starts to load, i.e. network, AVG etc etc in the taskbar but randomly, it just restarts. So I try to go back into it again after the restart, then it still don't work. After a few manual restarts it decides to load everything and work fine...why is this? I had this problem with XP, now with Vista. I'm thinking its my hard drive, but I don't have a clue.