Windowsmedia setup issue, XBox extender, IR remote

[computhom1]

I am having an issue setting up windows media center on my computer. I am running windows 7 ultimate and have set up an xbox 360 as an extender in another room.
I have been trying repeatedly to get this set up and keep coming up with the same result. I get to see the channels that I receive through a set top box from Comcast, which is an HD/DVR also. I get to see my channels the way that I ought to on my WMC guide but cannot change them, either through the remote on my PC nor on my xbox 360 in the other room.
I can view the channel that my set top box is set to but have to change that via my STB remote from Comcast and therefore if I am in the back room and I want to see another channel then I have to come out to the living room area and change the channel which defeats my whole purpose of having an extender in the first place.
The Hd/DVR is a Motorola and I have tried the set up in WMC and nothing seems to work.
The channel that I am viewing via the xbox 360 is perfect with no other issues than not being able to change the channel.
The guide shows me the channel that I want to be changing to and gives me an updated guide view but it is the screen itself that just remains on the STB channel.

 

[dsperber]

Please provide more details about your hardware setup and arrangement. Cabling, tuners, network layout, etc.

Do you have a Ceton tuner card in your HTPC? Do you have an OTA/ATSC tuner card? Silicon Dust HDHomeRun??

How are you feeding your Comcast cable content to your HTPC? What does WMC think you have for tuners, and channel-selection?