It is not a simple thing to solve a problem like this without having access to your pc.
It could something as simple as you having the master-volume slider in the 0 posistion, and it could be a hardware conflict in the installation of activeX -thats the span of grief we are talking about.
First thing :
can you play any sounds at all on your pc?
second:
If you have audacity (http://audacity.sourceforge.net/download/) installed
Does that work?
i wont promize that this can be solved