Encountered error in JavaScript window

I have tried to do a search on some blogs and forums to see if anyone has a solution to my problem, but cannot find any useful and helpful article. I have tried to play a media clip on Adobe Acrobat player but unable to get to play. By the way, I am using Windows XP SP3 x86.
The message I got initially said that “Warning: JavaScript Window- Acrobat has encountered an error while playing this medial clip: Adobe’s Windows build-in player cannot play this format as the required decoder is not installed on the system.
I am sure anyone has probably an easy to sort out answer for this one. If you’re quiet knowledgeable on this application, please help me. I am very grateful in advance for any help.

