I get the same problem but i have an audigy 4, i dont think that matters cause i dont think it is sound related
i have 3700+, 1 gig kingston dual channel kit, 7900gt
here is a screen shot of what happens to me
http://img451.imageshack.us/img451/7...problem1ib.jpg
ps, it doesn't just happen to me in this spot, it will happen anyway after 5-10 min of playing.
pss, it happened to me in the prey demo too.