Wi Fi Radio Can't see my Itunes on my Pc

Hi, very new here, so please bear with me. First off I may (and probably am) doing or not doing smething stupid here. I've recently bought a new Dell Inspiron 545 with Vista installed. Ive moved my Itunes from my old Dell to the new one. No problems there. It's working very fast and efficient.The problem I'm having is trying to connect a small DAB TRANSIVER wi fi enabled radio to see my Itunes library. It connects through my BT Hub to the Internet radio stations with no problem, but when I try to awitch it to find the PC it just says network error try again. It shows on it's display a 'shared follder' and am 'empty folder'. Now on my old Dell XP it connected, recognising the computer name and I was able to drill down into my Itunes and play them. Now I've looked at everything on Itunes bu can't find a solution there. So I'm thinking it must be some settings on the new Dell I've not found or corrected. Does enyone out there have any ideas. thanks.