I been using windows media center with a 4 tuner ceton card and a 2 tuner antenna card for 6 tuners and a 3 terabite harddrive. I never planed to leave tivo. but i built a very fast gaming pc to replace my old and slow ps3. Then i wanted to see if my computer could replace my tivo hd and my blu-ray player. and it could. my windows 7 computer replaced my ps3, blu-ray player and tivo hd.