ok... after i download a video it is in my media library.. but when i try and click it and view it NOTHING happens..... i can't get windows media player or realplayer to play it.... can someone help me to make like wmp or realplayer as like the default to play movies... thanks!

That's if it is a video. How large is it? Tips on downloading videos: Movie download issues (click on blue link)

You may need extra codecs to play it: CODECs list for Movies/Audio/ Alternate players / Video help forums and I'd highly recommend getting VLC player as a back up player as it has in-built codecs.