FATAL ERROR: Unable to initialize display

[Dehumanizer]

Hi,

every time I try to run Amnesia: The Dark Descent, I got this error:

FATAL ERROR: Unable to initialize display!

Is there any way to solve this?

P.S.: My drivers are all up to date. I found a topic here in the forum, but it's for MAC: Link.

System specs:

Phenom II x4 925;
2GB RAM DDR2;
ATI HD 4650.

I realy want to play this game, it looks amazing. Sorry about my english. Thanks!