i want to record shows from my hdtv/monitor

  mariojr 00:04 09 Dec 05

I have a dell setup pentium 4 1 gig ram 250 gig hd with xp home that is hooked up 2 a 30 in hdtv tv which doubles as my monitor I can watch tv and surf ect at the same time. can someone tell me how I can interface the 2 so that I can use the computer as a tivo type device. there are many ins and outs from the tv and video card on the pc and the hd box from the cable co.I'm hoping that some software will make this happen and I know there are tv cards out there but it seems like a waste with the setup i already have.
thanks to anyone who responds

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