Switching the user interface language is only supported through the
Multilingual User Interface Pack (MUI). The MUI is available for
corporate customers only through volume licensing contracts; it's not
available in a consumer retail package.
(you may want to read that whole page from the top)
--
Regards,
Paul Gorodyansky
"Cyrillic (Russian): instructions for Windows and Internet": http://RusWin.net
Russian On-screen Keyboard: http://Kbd.RusWin.net