1- Copy URL of the youtube page containing the video you want to download.
2- Goto www.youtubex.com and paste the URL in the provided space, and click the “Get Video” button.
3- You’ll see a small snippet of the youtube page in a frame below, along with a download button.
4- Hit the download button. A window opens asking you to open the file or save it on your computer. Choose the latter.
5- The file will take sometime to download, based on its size and your internet connection speed.
6- On completion of download, you’ll have a file with a .flv extension, which you can watch with flv player (http://www.martijndevisser.com/blog/article/flv-player-updated).
7- To watch it on windows media player or other players, you’ll need to convert it using an flv converter, which you can download here-
http://www.rivavx.com/index.php?encoder&L=3