One simple way to build a DVR is to purchase a capture card for your television (I hear these typically cost about $100, but they’re pretty awesome!), and get yourself the right DVR software for your needs. There might even be some free programs out there for you to consider. Supposedly, there’s a popular program called GB-PVR for Windows that’s free. Set up your hardware & software, and there you have it! What a great idea… I might have to do this myself!