Actually, this was a problem I experienced awhile ago.. I never solved it because I only installed it on a whim and didn't feel like troubleshooting it..
I've seen this come up though here, and IIRC the solution was farily simple, I just can't recall what it was..
Unfortunately a search didn't help me either.. It could very well be a corrupted disc.. (I'm really hoping that's not the case because mine probably suffers from the same thing)
I'd try to re-install the game again, but I really hope someone remembers what the solution was for this issue.. (I may actually be remembering something closely related to this being resolved as well.. It's been a long time)