So I'm currently running Vista & XP. I don't remember when exactly it started happening, but over the past couple weeks on my initial startup of XP (don't use Vista that much yet) shortly after I enter my password and while the utilities (Speedfan, etc.) are in the process of loading, it restarts like I've hit the reset button. I haven't changed anything in XP or on my system as a whole recently, so I'm a little confused at what's going on. After the first reboot it runs without any problems the rest of the time I'm on it. Seems to do it after it's been turned off for more than an hour...?