Problem in connect X Box with windows media centre ?

Sir, I want to connect my x box with the windows media centre but i am unable to do so ! I have tried all thing, I disabled the firewalls and it wouldn't connect, I reinstalled the extender and it wouldn't work, I checked the router firewall and allowed it, and rebooted it and it wouldn't work, I restarted the computer and it wouldn't work, I restarted the x box and it wouldn't work and I also turned on media streaming and checked the network settings and it wouldn't work but still m facing problem to connect it . So, can anyone plz help me in dis ?