No sweat mate, try a different sound plug in or play about with the configeration of the one you already have.
Happy enough to keep helping if you want but really it is all trial and error at least it when you talk to me it is lol
I use
P.E.Op.S. Soft Driver 1.17 - Video
Eternal SPU Plugin 1.41 - Sound
ePSXe CDR WNT/W2K core 1.5.2. - Cd
but the only reason is because they were at the top of the lists on the site I downloaded from. Ain't had any problems with them.