dungeon keeper 2 demo

i played both DK games when they came out and i just had a comp built to play COD 5, so i'm pretty sure it should work, but, i've tried to download the demo from 3 or 4 different sites and nothing. it seems to install just fine but when i try to play it, the screen goes black, like it does before COD 5 starts up, but then it goes straight back to desk top. i plan to buy the full version if i can find it, but for now, i must play this game.
has anyone else had this issue?

Try disabling all video acceleration and/or disabling Direct3D in dxdiag.

do you happen to know anything about the ATI Raedon x1950 pro's? i have two of them so do i turn them off seperately and if so, what will the graphics run off of?

i have been beaten. i'm just going to buy a junker specifically for the game.