Weird (overlapping?) textures.

I have a GeForce2 64mb with the newest drivers from In RTCW and Serious Sam:SE some far away textures seem to overlap and run when I move. It seems like a buffering problem but I have tried all options. Is there some way to fix this?

Also, in SS:SE there is a grainy-fuzz around some animations. I don’t know what it is.