OK i just put some upgrades into my system and im not sure if windows is unstable or ive forgotten something but i get hard crashes after running wow for not-so-long. essentialy i have time to load wow, possibly login and the system will freeze and sometimes restart, no warning, no error dialog box, just frozen. the system doesnt overheat and to my knowlege nothing is incompatable/not working. I just flashed my bios and all my drivers are up and running. My system specs are:

amd phenom 9950+ quad core be 140w
asus m3a78-t mobo
geforce 8800gtx
4gigs of geil pc6400 mem 800mhz/4-4-4-12cas
700w psu

thats all medicly relevant i can think of. a friend told me this behavior is indicitive of a graphics card discombobulation of some kind, but theres no graphical indication of this, ie weird textures. its possible though. i was thinking it could have been my mobo overheating, but it never gets above 45c (warm but not enough for a crash). im really stumped on this one, i recently ran 1 instance of wow crash. what could be the problem with this guy? some of my hardware is at the mobo standard specification, i havent fiddled with it just yet, could that have something to do with my misfortune? thanks