Not sure where to post this.. so forgive me if this is the wrong place for it. I have been getting hard crashes last few days. semi reliable crashes.. i mean that they happen for sure If I'm multi boxing. Ill post my PC specs at the bottom and anything that might help. Ill try to describe what happens best i can. When i crash the screens ( using two monitors ) get crazy lines all across them and then the PC just shuts down or reboots. out of the 10 or so times it has done this i have got a glimpse of a critical error box once.. but most the time it just crashes and never has time to let me read any error message. So I'm a bit clueless as to why its happening. I get no blue screens. just BAM!.. reboot.

It seems to only happen when I'm multi boxing. I have played for hours on my main with no crashes. It started the last few days ( SP1 maybe? ) I had a crash problem one time on another PC that ended up being my sound blaster card drivers or something.. disabling sound fixed it ( boo ) I disabled sound this time and it still crashes. so its not that.

my specs are

P Q6850 3.00 OCd to 3.66 ( water cooled )

1k wat coolermaster PSU

Asus P5E3 deluxe/wifi lga 775 x38 MB

4g of ddr 3 mem

Vista ult64 bit ( SP1 )

two rad 3870s in xrossfire

1TB hitachi 7200 HD

If its SP1 ? is it hard to revert back to the last version ?

Any help or advice . i will be gratefull ( before i have to haul this big ass PC to the shop and be without my game for days 8( ..hehe )