Does it have a DVD player?
-if not, that's the problem
Does it play other DVDs?
-if yes, try cleaning the disc with a few drops of water and a soft cloth. If no, see my reply in this thread.http://www.tomshardware.com/forum/259413-32-drive
What media player are you using?
-not all media players can play DVDs. Try downloading and using VLC media player.http://www.videolan.org/vlc/