My webcam is not producing audio feed

Hi,
I often chat with my husband using the windows live messenger, but every time we make use of the webcam, I seem to experience problems hearing his audio feed.
My audio device works fine, in fact I play music from my computer while chatting, and I can even hear every sound produced from my computer.
However, the problem is, I cannot hear anything from his webcam.
I am not familiar with technical things like this, so if anybody would be willing to help, I will greatly appreciate.
Thanks.
