Windows Media Player Wont Install

well now im having problems with windows media player i cant uninstall it anymore cuz its not in the add/remove section...its cuz i wanted to completely take out windows media player and reinstall it cuz it wouldnt work...also i deleted its registry keys in the windows media player folder...now when i try to reinstall it says this error message: "This version of Windows Media Technologies is incompatible with this version of Windows. For more information, view the information at the Microsoft web site." i wonder why it is not compatible with it cuz i downloaded the right one, xp version, and when i view the website it just says to download a fresh one and reinstall but i cant reinstall cuz it keeps on saying that error...when i try to click on the windows media player icon that is still in my comp it says:"one of the library files needed to run this application cannot be found"...hope you guys figure out a way of my problem...thanks in advance