Game shuts down computer on start of new game

[millhouse]

Hi all,

Everytime I start a new game the prologue writing appears, but as soon as the game starts, it instantly shuts down my computer. I dont even get to see the picture, just instant shut down. I am trying to run the game at max settings, but even turning them down doesn't stop it from shutting down.

Specs as follows:

i7 920 processor
10gb DDR3 RAM
640gb hard drive
GTX295 gfx card
700w PSU
Vista Home Premium 64bit

All other games work flawlessly at max settings, including crysis and crysis warhead.

Any ideas on how to fix it?

Oh, and im using the latest beta drivers 185.81

Thanks