Thi is latest K-Lite Mega Codec Pack . It has every codec you will ever need to play anykind if video . It also has advanced tools for those who want to encode teir own videos . If you don't want the extra tools just choose default when you install the program.
This is a free program so no patch or keygen is needed , also during setup it will try to install ask search engine to your browser , click no unless you want this add on. If it installs it anyway just go to add or remove programs ad unistall it. It comes wth Media Meda Clasic HD that will play Quick Time and Real videos as well.