[360] Media connection troubles...

Ok so I have my 360 elite hooked up to my router via a chord. I can use Xbox live fine, but when I try to do things like use my music from my computer it doesnt work. I have both Zune and Windows Media Player 11 installed and followed the guides to make then compatible with eachother.. But when I try to do it, it says no connection, and when I test my connection, everything else loads except for PC connected. like it isnt reading that I have it conencted to my computer or something, does anyone know what to do with this?