Penumbra Black Plague Scrolling graphical glitch

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Hello!



I recently starter playing Penumbra: Black Plague and am encountering a graphical problem I cannot find a fix and Steam advised me to contact you.



The problem is during the game there are some horizontal graphical glitches occuring. They start at the top of the screen and slowly move down. It is most evident when they intersect with a straight vertical edge and as I spend a lot of time peeking around corners in this game this happens very often. I find this problem breaks my immersion in the game continually even though it does not prevent me playing the game.



I have tried adjusting all the graphical options and changing the resolution but nothing has impacted the problem. I play on an alienware m11x with a GeForce 335M graphics card. 4GB ram and an Genuine Intel ® CPU U7300 @ 1.30 GHz 1.30 GHz.



I've turned off all background programs to no effect.



Best regards,



Nick



PS Please find attached a DxDiag file taken moments before sending this email.