Not working

Hi People..I am a Newbie so any help or advice would be greatly appreciated

I have recently changed from TVMOBILI to XBMC...TVMobili worked ok but the interface was not very good.. I have installed XBMC exactly as described but it is not functioning via my BluRay Player.. I have installed it so my Blu ray downstairs see's the network so I can stream music and films from my PC to my living room...My Sony BDP S470 can see the network but fails to connect...I have checked all connections etc and everything appears to be ok..

Is there something silly which I am missing

Thanks