Well i was pondering about the hibernation thing, the only possible conclusion other then some werid as power problem. Would be a setting in the BIOS. Have a poke around, some BIOS's allow a timed awakining from sleep/hibernation, if thats set to 2 mins, then that would be the problem. Easy fix
.
If its NOT that, something deep down in the Vista machine is causing it to forcebly awaken. Have a look in scheduled tasks(type in task sch in Vista menu and hit enter
).
But on that note, does it still do it during "Sleep"?
(If you didnt know what the diff between the two is, Hibernate saves sessions to memory AND harddrive, so if power goes out, you still have your work(As RAM cant hold data without power(well 10seconds it CAN last)), while sleep just saves it to RAM. The question why not only use hibernate? Well it takes longer to get into(As it dumps it to HDD).