Ok, one question, are you trying to take it from the Folder onto the Zune software then onto the Zune symbol? If, you are you are supposed to make the Software read the video file, in this case .mp4 and then once the software has the file in your collection you can then drag and drop it, but before you try to place it on your zune make sure the file can play through the Zune software, if the software cant play it then most likely the Zune cant.and another thing about getting youtube videos there actaully is a faster way to get them as direct .mp4, heres the site
, about the music, try and put all your music into one folder and not spread out on your computer, it makes it easier to get all of your music onto your Zune, once you've got them in one place find out that folders location on your computer normally it'll look something like this C:\Documents and Settings\Users\All Users(or your name if its your computer)\Music or if you use Vista like me C:\Users\(your name)\Music
and for the same for videos except Videos replacing Music
It took me a bit to get used to placing music onto my Zune also, just be patient with it
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I, personally, call my own self a Rhythm Enthusiast,
9366songs, 118vids, 467pics 105podcasts, and still growing
But my friends just call me a Music Whore .