A lot depends on what kind of television (really, what kind of output ports there are in the television) and what kind of input ports and software you have on the PC. What may also be important is where does the television signal come from? PCs are generally not designed to display television broadcasts from a television so it is not a straight-forward plug-this-in-here thing. (As a matter of fact, it would be easier for me to put my computer screen image onto the television than vice versa.)
I have a few options. Instead of Windows XP, I have Windows MCE on my laptop. I could buy a special tuner card for my laptop, which would allow me to put the cable signal directly into the laptop, and from there I could tune (unscrambled) channels. I also have "Firewire" input to my laptop, so I can hook that up to my HD cable box, which happens to have a Firewire output port. I also have a DVD burner so I could burn the program onto DVD if it isn't copy protected, and then run the DVD on my laptop.