Comp Buggy Blueprint Sims 2 Question?

Sims 2 Question? - comp buggy blueprint

I've recently bought the Sims 2, at the same time I bought a new PC. The PC is top of the region with an incredible graphics card, etc. ... But skip the game is really buggy, go slow and crashing flashing colored walls and no zoom and eventully computer. I've tried uninstalling and reinstalling, but still the same. Please can someone tell me how this is to stop a project of the graphics card, which seems to be the answer for everyone, and there are a lot of space because it is the only thing in the composition. I do not want to pay another £ 35 for another game and another solves the problem?