OK, make sure you've unzipped the whole folder and are running it unpacked, then after the owl screen (do you see that?) it can take a few minutes to pre-calculate everything - might be as long as 5 minutes on a really slow machine. I'm not using any 'magic' 3D tricks, so it should work on pretty much anything with OpenGL support. Let me know how you get on.
Cheers!
Jim