Can't roll back Windows media player 11 to 10 in Windows XP

Hi,

I have WMP 11 and it's seems impossible to rollback to WMP10 I try everything I use some soft like xp lite I remove wmp 11 now it's not appear anywhere. When I run WMP 10 setup I got this "A more recent version of Windows media Player running on you computer Setup cannot continue' When I go to the control panel it's only ask me to rollback to previous version. I think WMP 11 is integrated to my version of XP.

Thanks