Did you try to play a DVD and couldn't?
  Playing a DVD...

If you are using a computer/laptop that is AD, you will not be able to play DVD’s using Windows Media Player.  To play a DVD, you need to use the new NISD DVD player.

Click Start > Programs>NISD DVD Player>NISD DVD Player.

When the window opens, click File > Open Disc.

When your movie starts playing, you can maximize the window to have the movie play full screen

Click here for video