To play DVDs using the Player, you must have a DVD-ROM drive, a computer running the Microsoft Windows XP operating system, and either a software or hardware DVD decoder installed on your computer.
To play DVDs in Windows Media Player (version 9, 10 or 11) you need a MPEG-2 decoder that is capable of decoding DVD video and is also compatible with WMP. The K-Lite Codec Pack contains a compatible decoder. Some examples of compatible decoders are: Cyberlink, DScaler5, InterVideo, MainConcept and nVidia PureVideo. There are two types of MPEG video, MPEG-1 and MPEG-2. The most common one of these two that is used in .mpg/.mpeg files is MPEG-1.