You need WinTV (hardware and software) from Hauppauge.
You can either get a PCI card (to put inside your desktop computer) or a USB device (to plug into a USB socket on your desktop or laptop computer).
You can but the PCI card version with software from Amazon for �24.65.
http://www.amazon.co.uk/gp/product/B00004VU5G/ 026-3829584-4567648?v=glance&n=560798
More expensive versions are available which can record programs, which have a remote control, or which are suitable for digital TV.