Step 1: Open QuickTime by clicking
on the icon which is usually located in the Applications folder or use
the Spotlight tool (located in the upper right hand corner of the screen
on a Mac)
Step 2: Under the QuickTime Player menu bar, select Preferences
Step 3: Check the box next to “Show closed captioning when available.” Closed captioning will now be displayed.
Note: Closed captioning will only be displayed if the media file being played includes closed captioning.
Windows Media Player
Step 1: Open Windows Media Player by clicking on the desktop icon or from the Start menu.
Step 2: On the menu bar go to "Play" --> "Captions and Subtitles" --> "On if Available". This should allow closed captions or subtitles to play if the file includes them.
Step 3 (if necessary): If you are certain that captioning is available but it is not being displayed, you may need to restart Windows Media Player. If this does not work, from the menu bar go to "Tools" --> "Options”
Step 4 (if necessary): Click on the "Security" tab and make sure "Show local captions when present" is checked. Be sure to click “Apply” after checking show local captions.