As always with video clips, if you do not have the right video codec's, or the movie
was edited with non-standard codec's, they will not run. Within QuickTime (and within Real Video and Windows Media) are components of
the software called "codec's." A codec is the actual part of the software that compresses the
video so it will "fit" over the internet, and then decompresses the video on playback on your
computer. In the past two years, significant advancements have been made in these codec's, so now video clips
have many distinct and dramatic improvements over what was offered previously: To find and update your codec's try a
few of these links.
 Codec Package From Microsoft For IT Professionals
 Free Codec's For Many Video Needs
 Official Site For DIVX Video
 DIVX Movies - Codec's For Windows & Mac