Very dissapointed with Burnout Paradise PC.

I already have Burnout paradise for PS3, but i figured id try the PC demo. Well, as it turns out, what they claimed was wrong. I followed Burnout Paradise from the begining, both PC and console version, and was excited when both of them came out. When PC version was announced, Criterion said '...We are working to make Paradise PC work for everyones computer...'. That is not true for me. I get about 2-5 FPS while driving, and 1 or less while screwing around in the menu. WHat can i do to get better (however slight) performance?
(sorry im complaining here, Criterion closed their forum)

(sorry im complaining here, Criterion closed their forum)

