Media Center and Cable TV--accessing channels over 158?

I have land-line cable via Mediacom and a set-top box that controls a TV downstairs. It is also connected to a computer upstairs, and I've had no problems watching cable TV on the computer.

Unfortunately, our cable service has channels about 158--the maximum allowed channel number to add according to Media Center. Does anyone know a work-around for this? I read something about "you'll need to set up Media Center to control your set top box" but that went into no detail. Is that feasible? Or do I need a digital cable compatible computer to watch them? I am fairly certain the computer is not.

Any help would be greatly appreciated. Thanks!

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