This could be all sorts of things.
Firstly, is it just happening with that specific game, or all your games?
Edit: sorry, I misread. From the way you write this I'll assume it is just this game. I suggest re-installing, checking the disc for scratches and making sure your drivers are up to date. Also, if you're using a more modern OS than the game is designed for (I don't know off hand what OS this game is specified for) you may have issues playing it.