you DONT NEED A PROGRAM...just go onto this website
WWW.VIXY.NET and convert anything from youtube...check it out it's nice!!!.............
This service allows you convert a Flash Video / FLV file (YouTube's videos,etc) to MPEG4 (AVI/MOV/MP4/MP3/3GP) file online. It is using a compressed domain transcoder technology (outline in Japanese). It converts FLV to MPEG4 faster and less lossy than a typical transcoder...All you have to do is Copy and Paste the Youtube Link there and wait few seconds while it transfers, then the Download link will appear and download it...it's pretty quick & easy...
CHECK IT OUT!