Got a wierd problem

Everyonce in a while my computer will restart by itself. There is no set time when it does it. When this does happen, it'll shut down "nice like". What I mean by that is it'll shut down all running programs one by one then shut itself off. Once its shutdown, a move of the mouse restarts it, and by that I mean, just like I hit the power button, energy star, bios, raid card, load vista, back into my os. None of the power options have any feature to hint at what the hell this is, wake on device on any of the HIDs or any interface device is off, wake on lan in the bios is off, all power options in the os are set to shutting nothing down by the monitiors. The other kicker of this is, if I have a movie or any media playing, it'll wait til the media is off or has ended to shutdown.

Windows Vista x64 Ultimate sp1
3ware 9650SE-4LPML
raid 0 - (2) Intel x25-e
raid 1 - (2) SAMSUNG Spinpoint F1 HD103UJ
Intel Q6600
ASUS p5w DH Deluxe
Evga Geforce 7950gt Ko
(4) Geil ddr2 2gb 800mhz
Logitech Wave Keyboard mouse set

If you guys need any other information let me know... Thanks for any help

Check your update status. Window, flash whatever. It sounds like windows is shutting down to update.