accelerated sounds in desert combat

wtf causes this? anyone have any ideas on how to fix it? It's really distracting annoying, it's only the voices that do it though..the sound effects seem normal.

XP2100 o/c'd to 2.17ghz
MSI K7N2-L nforce2 mobo
onboard sound (ac 97 I think, not soundstorm)
2x256mb pc2700

winxp pro all updates
all drivers are current, no beta's.
bios is current

not sure what other info is needed but ask and ye shall receive :)

not sure i understand the "accelerated sounds" bit...

well, it's like, when someone does a radio command, it sounds like tape playing on fastforward. higher pitched and said a little faster than normal. I don't *think* it does it to me in regular BF, but it's been a while since I played it, and the only reason I know it's not normal is from people playing it at lan's that I go to regularly.

The sampling rate, perhaps? Try resetting to "low" defaults in the sound control panel, then try medium, then high.

I have this problem on my old laptop, but once I upgraded to .6 it got better