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If you want uninstall Windows Media Player 9, follow the next steps:
Open the Command Prompt. Go through Start -> Run and type cmd and press the OK button.
On the command line fill in the following line of code: rundll32.exe setupapi,InstallHinfSection InstallWMP7 132 c:\windows\inf\wmp.inf (see picture 1).
Now just install whichever version you want.