Strange graphical bugs (video included)

[bigparty]

just registered so i could post this. I am having problems with decal textures like bloody paw and hand prints flickering in and out and blood trails disappearing. I have an ati x1650 pro and can play most game on pretty good settings with descent frame rate but this game seems to hog. im running on medium settings with like 30 fps but can play cod 4 on high with 40-45 fps. I didnt have any problem with the first game.

hi. I have the same problem with ati x 1600, i can play cod4 but not penumbra. How can i do?

pentium 4 3.4ghz, ati x 1600 with 512 ram, RAM 2 giga.
I tried to set graphics options, but i have big problems with framerate and with the graphic.
Please help.