Well my problem is a bit different from what is mentioned. My graphics card is ATI sapphire 4850 and here's my problem:
http://img532.imageshack.us/img532/8301/59137772.jpg
As you see in the screenshot, the map is not in the place where it should be and the window vision is also not in the right place. This changes as i move the camera. Some objects also disappear at certain angles but i don't have the 'invisible walls' problem. I tried the patch and what you suggested at the first post but nothing changed.
I would appreciate it if you could help me with the problem. And i should say that i respect too much for your work. The game's certainly a new breath for horror/survival games. And sorry for my lame english =) Thanks...