then that is probably your problem.
You'll need a driver for your usb dongle that has an audio driver built in.
I couldn't find a driver for mine but I just installed the BlueTooth manager software and it worked for me.
This is what I downloaded... obviously can't say if it'll work for you...
http://www.windigosys.com/3.1c.zip
(btw the server was really bad for me. Make sure you use a dl manager that can resume or you'll be redownloading for days)