If you got Windows Media Player to even recognize the file, that means your computer has some codec pack or other installed. I can't be sure of exactly what you did from the posts but I am guessing that you installed CCCP and CoreAVC on top of another codec pack. Very much the recipe for disaster.
My Recommendation:
1.) Get rid of every player. They are of no use to you (except Windows Media Player, that one probably won't leave your system anyway)
2.) Get the CCCP Insurgent, and delete every codec pack and individual codec stuff it finds (even CCCP and stuff, just to be sure)
3.) Then install CCCP, and in the settings menu make sure you check the option that says Autoload VS Filter (in the second menu after you click next)
4.) Try playing the file then with the only player you should have left: Windows Media Player (cause I'd be stunned if you managed to un-install that without messing up something or other in your system).
5.) Then, the only remaining problem would be your system resources. If, and only if, your computer is on the verge of being able to play the file flawlessly should you go for CoreAVC. If your computer just sucks then even that program won't be able to do much for you. CoreAVC's real advantage is offloading to GPU, and that works especially well if you have an Nvidia card.
If you have an old Windows Media Player, then use the MPC included with the CCCP. If on the other hand you have WMP 11 or especially if you have 12, then don't worry about it.