Connect it up to the pc & media centre will (should) discover it & configure it or you. Start media centre, go to tasks/settings/tv/set up tv signal & follow it from there.
Media centre creates a folder called recorded tv, you can decide on the size in mb/gb's & media centre will tell you how many hours that equates to, given the quality settings you tell it to record at. Anything you record via meda centre will be in dvrms format, so if down the line you wish to burn something off, you will need a converter utility, but these are readily available.