hello , i have played nfs with the same cars that you get when you start the game .... so my question for you guys or girls is how do i win new cars i have played many races but have only won parts,..... so can anyone help me to win the F**** CARS..!!!!!!

Have you beaten a entire area yet? if so you should be able to go to a car dealership and buy the one you want it is pretty simple

Yea, if you go to the map screen, just move the cursor and you should find a car dealership with the unlocked cars for purchase.