I can't get windows media player 10 v.>>> to 9 v. To work

I have recently install windows media player 10 beta V.
but i had problem with some programs so i decide to
unistall it and continue with the last vertion i had but
i can't install the windows media player 9 any more the
computer said that there is a newer vertion of windows
media install. i try to delete de file from add and
remove and it only unnistall the file but didn't deleted
and i think that's why i can't istall the 9V. can some
one help me fix this problem. i really aprecited.