[damien c]

ok i am currently running windows xp 64bit, on friday i reinstalled my copy of vista ultimate 64bit started playing a game of call of duty 4 and my system crashed twice, but it had been running fine for everything else all day even when playing call of duty 5 and crysis.

ok an hour later i was back on to xp 64bit everything works great can play games, never crashes etc but i decided yesterday i wanted to see if it was just a dodgy install of cod 4 that caused it, i reinstalled vista after doing a backup of my xp install here's where the issue starts, i was playing cod4/ cod5/ crysis/ unreal tournament 3/half life 2 all played fine with no issue's all day then at 8pm, i went to play cod 4 again and my pc crashed so i rebooted and again it crashed so i tried another game, and it worked fine so i tried cod 4 again and it crashed so i tried another game again and it crashed aswell so now i am back on my xp install.

now i'm thinking that it is driver issue's but does anyone else have any idea's,
also just to add it does the same while overclocked and not overclocked specs below.

Mobo: Asus striker ii extreme NB watercooled
Cpu: Intel Q9450 oc'd @ 3.6ghz watercooled
Ram: Ocz ddr3 1333mhz oc'd @ 1600mhz
Gpu: 2x Bfg nvidia gtx280's sli'd watercooled not oc'd
Psu: coolermaster 1000w modular
Hdd's: 1x WD velociraptor 300gb 10,000rpm 2x samsung 1tb 7200rpm

as i say it all works fine on xp64 but under vista it crash's the reason i want to get back to vista is because, it doesn't perform that well under xp can
't multi task aswell under xp.

i hope someone has a idea as it's got me stumped.