thing is I downloaded the demo yesterday and when i try to play it it keeps saying that thefile must be closed and if you want to submit the report to microsoft blahblah

i keep getting that message, and i cant play the demo i was aching for!

my computer is:

amd athlon xp 2800+
2gb ram ddr333
ati x1950 pro agp
creative x-fi fatality
hd 200gb maxtor

please help me! btw ALL my drivers are up to date

thanks fellas