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    There are some group policy configurations (see http://www.microsoft.com/globaldev/reference/win2k/setup/restrict.mspx, although its old)
    For XP: http://www.microsoft.com/globaldev/reference/win2k/setup/changeui.mspx ...
    ... visit the Configuring and Using International Features of Windows Web page (http://www.microsoft.com/globaldev/reference/win2k/setup/default.mspx). ...
    Get help with Windows—upgrading, installation, hardware, security, networking, and more.
    You can find the different keyboard layouts here (works only with Internet Explorer): http://www.microsoft.com/globaldev/reference/keyboards.mspx.
    You can add display languages by installing additional language files. When you install language files, you can view wizards, dialog boxes, menus, Help topics, and ...