Floor and lighting spazzing out

[Sykan]

Okay, so it's my first time posting here. I just got this game and I'm using a Dell vostro 1000 laptop, with an ATI Radeon Xpress video card (I looked into some other threads and I'm not too clear at all on whether or not this meets the requirements for the game. Therefore, this thread may just be me being stupid.)

I can apparently play the game just fine except for two things- The floor textures spaz out on me, overlapping and changing elevation and doing all sorts of weird and nauseating stuff (Seriously, it gets one dizzy.) and the lighting has similar spazouts changing a lot all the time.

Any insight on how I may fix it?