K-Lite Codec Pack Full is a program that offers you all the necessary "codecs" to reproduce a wide variety of video files, even cutting edge DVDs.
Compared to other codification bundles, this software is the most complete of all, both in quality and in the number of utilities that it contains. On the other hand, K-Lite Codec Pack Full counts with the advantage of making possible the reproduction of all kinds of formats, even the least popular ones.
K-Lite Codec Pack Full allows you to visualize multimedia sequences, and it also offers the possibility of creating your own codifications. But remember that, to do so, you must be provided with a converter.
In short, if you have some movies that you cannot watch with your video player, install K-Lite Codec Pack Full and try again. Of course, the results will get you completely satisfied.