you have to have a media player as well. windows comes with one called windows media player. vlc is better because it will play anything even pirated stuff
discs dont automatically play when you put them in a pc by default. a pop up should come up asking you if you want to play the movie. if it seems to take a long time for the pop up to show up its probably because your antivirus is scanning the disc. if you go to windows explorer and search for the disc you should be able right click on it and tell it play too. or you might need to search the disc for the file you want to play and just play it