The game shows a 3D preview of vehicles in the purchase menu. The freeze might be related to that, so I suggest you should take a look at your videocard drivers. If that doesn't work, see if it also crashes without a mod. Just to rule out the Los Angeles Mod. You don't need a high-end computer to run this game. The game just isn't optimalized perfectly, so even on the best computer it can cause problems and tons of them have been reported on the forums. Only a handful of them are related to the Los Angeles Mod. Anyway, while a lot of newer games might run great on your computer, the forest fire mission in the LA Mod still has a habit to cause some lag for example.