Halo trial error?

well i got me a halo trial, but i get an error =(
heres the message
Halo - Fatal error

problem your computers video driver is known to have serious issues with the game. a newer version that is compatible my be avaliable. if you wish to update your drivers, please contact your computer manufacturer for any necessary assistance.
im pretty sure this can be fixable, since i downloaded new driver, and i ran dxdiag and screwed around with that.. =(
whats the problem?
thx