KoolKat

i have that problem with a black screen on start up, i bought the game on steam this summer and i had an older pc that it runned on good, then last week end i got a new pc (specs bellow) and im having that problem, ive tried that thing where you disable some memory and it fucked over my pc. ive tired 3 patched and nothing my specs are vista 64 intel core 2 Q8200 6gb ddr3 ati hd 4350 512mb 640 hard drive any help? or enough info?