You've just downloaded an .avi or .mpg movie from the Internet. You double-click to launch it, but all you get is sound with no picture
. Your media player lets you listen to it, but nothing is appearing onscreen. Well, if this annoyance has happened to you, chances are you are doing everything correctly, but you are missing a "codec" converter to play the video. Codecs are annoying, but they are a fact of Internet life. Take two minutes to learn about codecs, and download the fix here
...you'll have your movie playing in no time!