I have an XP. When I am in a skype call all audio works great. However as soon as I open another application that plays audio (E.G. YouTube, Itunes, Video Game) the sound from that application is streamed to the other people in the call. This happens even when my mic is muted. This does not happen on the other voice chat program I use (steam).
This is very annoying for the other people in the call, and I would like to resolve this as soon as possible. Thanks.
This is happening to me too. The strange thing is, everything worked fine, then in the middle of a call it suddenly started doing this and no matter what I do Skype keeps streaming all my computer audio to the others in the call.
right click on the volume icon in your system tray, then select Volume Mixer. You can see sliders theres where you can control the volume (or mute) of individual apps/program running in your computer.
for XP users where the Volume Mixer option is not available, you can disable the Stereo Mix feature.