Hi burtonboy158,
Unforunately as you already know XP does not support WMP 9.0 anymore, if you are desperate to get it back do a reinstall of XP and you will get it as it is the default player, but since you have upgraded to 10 it is too late now to go back with your current OS config.
Try to install WMP1O again only this time record the error message or messages you are getting then go here and have a read.
Code:
http://www.microsoft.com/windows/windowsmedia/mp10/errors.aspx
Error messages are identified by numerical IDs, such as C00D0BC2 and 800704CF
Identifing what the error is the first step to fixing the problem.