I installed WMP 11 but i doesnt work as well as WMP 10. I want to reinstall WMP 10. How do I do that?

I downloaded WMP 10 but my comp wouldent install it because i have the newer version of it which is wmp11. so i tried finding a way to uninstall wmp all together then just reinstall wmp10 since the my music floder has my music in it.