Help with Gore_test not working!!!

well i downloaded the demo twice and installed it manytimes trying to figure this one out. I have the newest opengl drivers and the lates drivers for my voodoo 2 card. i get an error if i launch the game in any desktop seting other than 800 by 600 high color and when i do get it to launch all i see is green diagnal lines and green blocks all over the screen= no text at all!!! it will hilight with the curser but that is my problem, basicly i cant read to play the game help me please if you know about this demo!!! thanks skinmagik

i forgot to tell you my system info here it is i have an intell i810 chipset, voodoo 2 1000, and i dont know what to do, i can run half-life with no problems…