Last night, my XP SP3 machine rebooted itself around 5 am. This surprised me as I was executing a long running process and did not want the latest updates downloaded or installed. When I checked this morning, the option was changed to Automatic but not by me or any other user. So I lost my information pertaining to the long running process. Is this something that Miscrosoft may have forced? Has anyone else experienced this behavior? Is this the behavior of some virus or rootkit that my machine may have picked up?