QuickTime is software used to play QuickTime audio and video clips. It is bundled with Mac OS X, but is a separate download for windows machines.
Check to see if you have QuickTime installed correctly
Windows
To Open QuickTime
Start->Programs->QuickTime->QuickTime Player
Mac OS X
To Open QuickTime
Go menu->Applications->QuickTime
URL: http://showme.angel.msu.edu/play_qt_content