Whats up everybody?
My name is Marc.
I have a problem, when I tried to watch a DVD on my PC the windows Media Player wouldn't play it.

This is the message I got: Windows Media Player cannot play the DVD because a compatible DVD decoder is not installed on your computer.

I clicked on WEB HELP to find out what the problem is.

This is what I got: DVD Playback Options for Windows
If you are running the Windows Vista Home Basic, Windows Vista Business, Windows Vista Enterprise, or Windows XP operating system on your computer, you might need to install a compatible DVD decoder (also known as a MPEG-2 decoder) before continuing with the following activities.

*
Playing a DVD
*
Playing a recorded TV show
*
Playing video files that were encoded with the MPEG-2 codec (.mpeg, .mpg, and some .avi files)

To purchase a compatible DVD decoder, visit Plug-ins for Windows Media Player.

Now I don't know much about Computers, but how can I get a decoder for free that can do all those things and make my Windows Media Player work again, because I prefer to have one program like Windows Media Player, that can play music and DVD movies, and not a two programs that does one of them

Software such as PowerDVD comes with the codec you need that you can then use with Media Player automatically. You quite often find this software comes with the DVD Player as standard.