Everything's invisible on Halo...?   

When I play my Halo demo on my computer [AMD Athlon Proc. 750 MHz, 576 MB 
RAM, NVIDIA GeForce2 100/200(Video Card)] every player, alien, weapon, and 
vehicle is invisible. I've uninstalled it and reinstalled it multiple times, 
but it happens every time. Is there anyone who might know what's wrong with 
it, or how to fix it? 

Thanks. =)

date: Fri, 21 Oct 2005 13:31:03 -0700   author:   F R E E Z Z