“How do you watch a DVD on Windows Media Player?”
To watch a DVD with Windows Media Player you need a special codec pack capable of decoding MPEG-2 video. Versions of Windows XP typically did not include this type of codec. If you have Windows Vista Home Basic, you will also need to acquire one of these MPEG-2 codecs. Windows Vista Home Premium and Windows Vista Ultimate both include an MPEG-2 codec that should make playing DVDs possible. While these codecs aren’t free (because you’re paying to license the technology designed to make DVD playback possible), you can get them for about the price of a single DVD. My favorite option is the CinePlayer DVD Codec Pack. Once you install the codec pack, DVDs should play in Windows Media Player anytime you put a DVD in your computer’s DVD player.