GAK. WinDVR is from InterVideo. <A HREF="http://www.intervideo.com/jsp/Company.jsp" target="_new">http://www.intervideo.com/jsp/Company.jsp</A> It requires a TunerBoard. <A HREF="http://www.intervideo.com/jsp/Supported_TVTuner_Cards.jsp" target="_new">http://www.intervideo.com/jsp/Supported_TVTuner_Cards.jsp</A>