help ASAP with halo problem

i hade the halo demo and it works perfect but i just got the full version and i cant se characters lights(just the glow) or doors......its not my video card because the demo works please if you know anything help

nvidia GeForce 2 MX video card
ADM Athalon 1.5 proccesor
windows xp home edition SP2
just ask if you need to know anything else

 

dude, try these three things first.
Number one upgrade your video drivers
Number 2, see if there are any patches for the game, check the official game site.
Number 3 - play around with the graphics settings in the game, you may have them set wrong or too high