Killing Floor texture issues

[lord_raken]

I just bought Killing Floor a few days ago and I am loving it. I do have some problems though. sometimes on certain maps the textures don't load properly. Often the streets on West London are a pearly while color. The same with the parking lot on the hospital map. The stairwell on the hospital map has a similar uniform gray texture.
The chainsaw enemy appears as a transparent reddish shadow (until I hit it with my laser site and then I can see it properly), and the enemy that shoots exploding fireballs just looks black. All of these are frustrating but I can still play and have fun...

However, the scope on the crossbow is glitchy. More often than not It will just show a molted gray and black texture, an amber toned view with without any crosshairs or random repeating patters that change as I move it around.

Any suggestions on how to fix this?