✔ 最佳答案
你去返windows的web site download DVD Decoder
DVD Decoder (MPEG-2 Decoder) Plug-ins
Windows Media Player becomes a full-featured DVD player when combined with a DVD decoder (MPEG-2 decoder) with features such as full-screen video playback controls, DVD chapter listings, and integrated cover art.
For Windows Vista
If you're running Windows Vista Home Premium or Windows Vista Ultimate, DVD capabilities are included as part of the operating system. If you are running Windows Vista Home Basic, Windows Vista Business, or Windows Vista Enterprise, you can enhance your DVD playback experience by purchasing a DVD decoder pack or by upgrading to a more powerful edition of Windows Vista.
For Windows XP
If you are running Windows XP, you can enhance your DVD playback experience by purchasing a DVD decoder pack. To find out if you already have a DVD decoder installed on your Windows XP–based computer and whether it is compatible with Windows Media Player, install and run the Windows XP Video Decoder Checkup Utility.
http://www.microsoft.com/windows/windowsmedia/player/plugins.aspx#DVDDecoder