To guy number 2:
If you read the back of the box it has the NVidia logo on it, and I think it comes up with the "The way it's meant to be played" logo on startup. I see you have an ATI card, maybe that is the problem even though the box says that all ATI Radeon chipsets are supported.
I have had ONE crash the whole time I have been playing, and have experienced the odd glitch on entering some areas sometimes (the same glitch that appears in HL2 with all the colored triangles on screen). I have a GeForce FX 5600, not the best performer in the lineup but reliable.
I liked the Haunted House quest, like a bolt of adrenaline shot thru me when that first lightbulb blows - totally shat meself. I've taken the cab to the downtown area, and from what I have played so far it is a far better game than Half-Life 2 although in a different genre mind you. If this game were an action adventure instead of a fullon RPG it would blow HL2 away.