Texture glithes in Penubra bp

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When i playing penumbra all walls are blinking.
i have installed both patch's and the same problem remains.

In penumbra overture patch solved the problem.

My video card: Ati radeon HD5970

i have readed, what i have to do to fix ati cards problem.

I updated ati catalyst to the newest version.
In catalyst control panel i changed all settings like it was writen in patch 1.1 log. except adaptive AA off. i couldn found where it was.
Also i changed windows 7 theme into basic (which means no aero)

And finally the same problem left.

What i have to to fix it finally?

it is hard to print screen of ths glitch, because it can be seen best when you moving in the game.