Black graphics, odd flickering random objects

[bp85]

I'm having the same problem as this person in the troubleshooting thread but they have not received a response. But I am using the full version of the game:
"
Im having trouble with a part of my graphics (note that im using the demo). i turn on the game it runs smoothly, except everything looks very off. theres no real textures. everything is black. but rugs and rocks are bright white (i assume there rocks i can't tell). so i exit and look into my documents and check the hpl i see an error that says: ERROR: Failed to compile GLSL shader 'C:/Program Files/Amnesia - The Dark Descent/redist/core/shaders/deferred_gbuffer_skybox_frag.glsl'!
Shader code: i either see that or ATTENTION: System does not support const arrays in glsl! please help. "

I have Vista 32-bit on a notebook and an NVIDIA GEforce 8400M GT. I've run through everything in the troubleshooting guide and am not sure what else to try.

HPL attached.