This has been driving me nuts too. I am currently using conventional PC speakers, with a Logitech USB headset for Skype.

I set the default audio device to Realtek AC97 Audio. If I use Skype, then click on a radio station, and the sound comes out of the headset.

Back to control panel: Default Device is now Logitech USB Headet.

Who is doing this? Skype or Windows.

I guess I have to switch to USB speakers.

Tom