every time i shoot an hit an object or ack hits near me i get a loud buzzing sound.  changed speakers, not the problem.  need help.  cant fly with sound up because of this.
system info:  gigabyte s-series mother board
amd duel core
2 mgs ram
e-geforce 8600 gt
windows xp
dunno what other info needed.
every thing else working great.  just this annoying buzzing sound as listed above.  
thanx for the help
S!