Movie Downloads

Hello, I am frustrated because I am downloading a movie and then when I go to launch it plays but I get no picture nor sound. I have real1, windows media player and quicktime. I am confused as to which one to set the file types on. For example I set windows media player to avi but when I download a movie in this type it will show playing but nothing appears. Can anyone help? Thanks

Click search at the upper right hand corner of the page and search for "movies wont play" - read this discussion on this problem.