first thing: what is your computer spec??
it is not actually hard to get this game running really sweet,
all you should do is download patch 9.6 and install.
then use major toms graphic file etc.
then turn your computer sound hardware to minimal, it makes the engine sound a bit crud but your playability will sky and you will get good graphics and good framerates and low po.
do all this, and you wont stop playing it!
also, if u havent got it already, buy a forcefeedback wheel and pedals like the ferrari thrustmaster one i have got!