Can some one anyone please help me solve this problem , i can't set up my windows media centre , the pc doesn't seem to be able to search for my extender any suggestions ?

you know..there is this thing called the Internet.

You could just google it up first or better yet:

go to this pinned thread here, which should explain most of your doubts:

http://forum.lowyat.net/topic/271599

all the best.