How can i uninstall windows media player 11 beta? i don't want it.?

you may think iam a fool to uninstall the latest WMP, but i have changed my mind now to get back my old windows media player 10 version. i faced certain problems with beta. i want to uninstall it permanently on my computer. when i tried to download version 10, it says in an error box ''latest version already exists, so installationn can't take place''. what to do? from where can i remove it?