Cars Not Appearing in Menu

[Nathan H]

So I recently found my old rFactor disc in a cupboard and thought id install it on my new pc having just been to a simulator centre that use it. When I had it on my old pc, every car, even ones I couldn't unlock like the Sauber F1 car, were available to at least look at in the main menu. Whereas on here, it only shows me 4 different models. I've tried altering my experience level through the game files and doing the ISI_BABYFACTORY exploit but they haven't helped. if anyone knows what is wrong, whether i'm stupid or the install has gone wrong, please let me know. thanks