Users select any one of the installed user interface languages* by opening Control Panel in Regional Options and:
In Windows 2000 MUI - On the General tab, choose one of the languages displayed in the 'Menus and dialogs' control.
In Windows XP MUI - On the Languages tab, choose one of the languages displayed in the 'Language used in menus and dialogs' control.
Changing the user interface language has the effect of displaying menus, dialogs and Help files in the specified language. Changes to the user interface language only become effective after logging off and logging on again.