Media sharing will not switch on in the network and media centre

Hi Guys
I have OS Vista home premium and service pack 2 on my PC which is connected by cable to my internet router. This router is connected by wifi to a router extender.
The router extender is connected by a LAN cable to my new plasma TV.
I cannot get my PC to share media when I tick the box in the media and networking centre in spite of the fact that the PC network map detects the TV. The TV does not detect a server but does show all the right IP addresses etc. so can receive data.
I know my network works because if I connect the router extender to the amplifier instead I get internet radio. I also have an internet radio squeeze box working in the kitchen which is connected by wifi to the router extender and that works too.
Both the squeeze box and the TV are detected in the PC media centre but I cannot share data from the PC with the TV. The plasma TV icon stays at the bottom of the network map.
What can I do to watch films etc on my TV from the PC ?
thanks
 

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