The speakers you speak of, pun intended, run both power and audio (digital) though the
usb port. The speakers then take the audio and convert it to analog and then amplify it to
the speakers. With that in mind, you need to convince the computer to send the audio
to the speakers. You need a driver for that. Thats the thing about PCs that I do not like. I like
the plug and play Mac. It can work. Look for a driver. You may want to consider posting on
a PC site too. They would probably know more about it.
-maestro