There are many programs to accomplish what looked impossible for a start: download videos from YouTube. But, if you still haven't found the best one for you, you have a new opportunity, try YouTube Download & Convert.
Download and convert videos hosted on YouTube
As its own name indicates, YouTube Download & Convert simplifies the task of downloading videos from YouTube to your hard drive so that you can watch them whenever you want, and furthermore, it converts them directly to the format of your choice of those supported by the application. Thus, you can save the video in one of the following formats: FLV, 3GP, AVI, MP3, MP4, MPG, MOV and WMW.
This application stands out due to its interface's simplicity. From the same window you will be able to indicate the video that you want to download by inputting the URL in the box that has been prepared for this purpose, as well as indicating the folder in which you want to save the converted video and specify the format that you want in the drop-down menu.