Downloading videos
 

I use Limewire on my Mac OSX computer and I'm having trouble w/ downloading files under the "video" category. When the download is completed I attempt to launch the video. A window pops up saying that "cannot be opened, software component needed by movie could not be found". Does anyone know what the problem is and know of software component I need so I can watch videos. Please help:)

ps. these are mpg. files, BTW