To Download the videos on the websites like YOUTUBE,YAHOO VIDEOS,YOUKU you need a download manager IDM Internet Download Manger which enables you to download all the streaming videos to download. After installing the IDM go and visit the youtube and click any videos to watch on the right cornet top of the video the download video icon will appear this makes you to download. To download IDM visit http://mirror3.internetdownloadmanager.com/idman605.exe