Render error, but abel to play demo

[victorjr]

Hi all
this is the first time I post on this forum, because the guys at steam told me to ;D.
Anyways, I got a huge problem. Because everywhere on the net, I saw thr render problem, so I asked the guys at the steam forums : if I'm able to play the demo, will I also be able to play the normal game. they said yes, so I tried, and I was able to play it, so I bought the game. But now I got the render problem, wich kinda sucks.
Is there anyone who can help me.
maybe something you also need to know, first a friend installed a cracked version, cuse he thougth, I might be able to play it, cuse he wasn't (old computer) but I got the render error.)
kr
victor
ps: here is the steam thread Steam forums, if I can run the demo balblabal