from the k-lite page:
The K-Lite Codec Pack has a couple of major advantages compared to other codec packs:
- It it always up-to-date with the latest versions of the codecs.
- It is very user-friendly and the installation is fully customizable, meaning that you can install only those components that you really want.
- It has been very well tested, so that the package doesn't contain any conflicting codecs.
- It is a very complete package, containing everything you need to play your movies.
btw: i have installed this package since many many versions (so, a very long time) and it makes absolutely no troubles - runs very fine, no config needed, just install it, reboot, that's it...
the only thing i do change while installation is, that i uncheck the "install movie player" checkbox (on the very top of the list), so only codeds are installed, 'coz i don't need that many different movie players on my machine...