Hello! i've reinstalled wr1 on my new windos7 and i get a problem when racing!!! my car crosses over the other racers!
when i used windows vista i didnt have this problem! what should i do? cause i want to crash my car with the other racers!
but it only crashes with the cars that stand across the street

Are you using the default MBWR cars or addon cars?
Looks like missing collision boxes for "the other racers", so maybe the installation of some addon cars went wrong (.cob files missing).

In case that's a group of standard MBWR cars, try re-installing the game.