Amnesia The Dark Descent Demo problem

[Catloaf]

@UndeadOmlet

I'm having the exact same problem where the menus are fine, and when you start a new game the fps is not even bearable. It's all black and I can only hear him talk, It then shows a corridor with a candle where if you look around it takes a while before the frame changes and none of the will buttons work.

Windows XP 32 bit
Radeon x1650