Problem playing music files on my internet radio

I have recently encountered a problem and wonder if anyone has come across this before. I have a Pure Evoke Flow radio and am attempting to play my music files held on my pc through this radio. The radio has no problem picking up my Windows Media Player /server and the tracks contained there. The radio lists all the tracks and artists but when I press “Play” it just scrolls through all the tracks without playing any – a bit like keeping your finger on the “next” button on your cd player. Anyway, there is another laptop in the house and the radio has no problem playing the files on that pc. I’m using Windows vista and this problem has only started since I recently added loads of music to my laptop. I have contacted the Support people at Pure but they are at a loss to solve this. Have also tried the factory reset.
Thanks for any help.
Stan