halo pc still crashing system

[Razor Blade]

hi all, even after 1.07 patch halo is still crashing my PC

to give you an idea of my system, I have windows xp prof sp2, P4 3.0 gig 1MB L2 cache, geforce 6800 GT OC, 1gig DDR ram....

both of my halo discs were bought from the store one of them was from the soundblaster audigy 2 soundcards that came with 5 games so both of them are legit so I don't know what the problem could be... I have norton AV and spyware software as well and as far as I can tell my system is clean

halo pc is the only game that crashes my system, other games I have do not cause any problems...

Microsoft can't seem to help somehow either, I've tried them before

any ideas?