Graphic Glitch

Hi

I only just bought the game and as soon as i booted it up and got into the intro with Jeff Goldbloom talking about the state of the world, as soon as the camera pans close to the ground my game's graphics start to spaz out with black shapes flickering all over the place and when i can control the camera and angle it just right it stops but the buildings are invisible.

Does anyone know what is wrong and how i can fix this?