If you updated the sound drivers and doesnt help try to install DirectX End-User Runtimes (June 2010) ,
and if this doesnt help try to change sound frequency:
1.Go to Audio settings click Sounds- change sound scheme to Windows Default (apply),
go to playback-speakers-propreties and check that device ...

I know you for a long time now my miss Sandra, we v been playing togheter even in previous clan, i can say only positive things about you,
if my vote counts is F1 from my side, hope you will get accepted. See you on server !
Your Mister