Rating 4, because it`s a great Pack, has all you need (and a lot you don`t need). But it doesn`t work with some components, like the Realplayer. Be sure to set a restorepoint on your pc before installing. Uninstalling makes problems, it crawls into the whole system. Download the free "Your Uninstaller" and choose the "force to uninstall" mode, then delete the rest manually from "windows>>>programs". No guaranties, every system is different. I would recommend to download the "Refiler" (found on this pages)and for the rest use singlecodecs (wm9codecs, BCMpegs2, Ympeg). This saves a lot of space and causes no difficulties with other programs. For detecting codes download "G-spot".