Are you playing a PAL game on an NTSC TV set (or vice-versa)? Although I'm not familiar with that particular game, there should be an option in one of the opening screens to choose between 50 or 60 htz. Most likely, you want to set it to 60 htz (NTSC/Amercian TV sets). Otherwise, try 50.

No option given? Then get one of the patches on the site that converts PAL to NTSC or NTSC to PAL.

If none of the above works, I'm not sure what the problem is.