How to play AVI, DivX, XviD, MPEG4 video files?

To play DivX, XviD (AVI) you first  need to install the DivX codecs or the XviD Codecs.
Then you should be able to play the video with Windows Media Player. It's also possible that you need to install some other video or audio codecs such as AC3 audio,
OGG audio or some other, read here below how to identify what audio and video codecs you need.
Or use MPlayer and you don't need to install any codecs cause they are included.