Windows Media Center 2005- DVR HELP!

I should have posted this here but anyway....I live in arizona and we have a cable service through qwest communications and it is called choice tv. How this service works is there is one gateway box that operates up to three tv's at once on three different video streams. So, our living room is set up on channel 6, my roommate's room channel 7 and my room channel 13. Well, when I try to set up media center to record any movie or show it changes to that specific channel instead of staying on my channel 13 and recording the movie on channel 147 (HBO- Constantine). Not sure if that made sense but what I need is for media to recognize that the tv needs to be on thirteen but record from a different channel. I have no idea how to explain this but that was the best I can do. If anyone can help me it will GREATLY appreciated. I really want to use this DVR feature. please help!
Thanks!