It is not possible to install a localized version of Windows Media Player 11 on a computer that is running a Multilingual ...

It is not possible to install a localized version of Windows Media Player 11 on a computer that is running a Multilingual User Interface (MUI) version of Windows.  Instead, install the English version of Windows Media Player 11 on this computer, and then install the appropriate Windows Media Player 11 language packs to obtain language-switching capabilities.