Im going to tell u the easiest way to download vedio from YOUTUBE.
At first you have to install orbit i've giving the link of this softwere.there is a tools called grab++.u can downlad video using this tools.when a video running on in youtube u just move the cursore on the screen.then there will be a button called grab.just click on the button then download the video.soooooooo simple.
http://www.mediafire.com/download.php?zm5ttjdmzio
