For XP
Go to control panel, Regional & Language Options, Regional Options tab: Set format to English (United Kingdom) & Location to United Kingdom.
Under Languages tab: Click Details button->settings tab->default input language set to English United Kingdom
Installed services, click "add button" choose Input & keyboard as English United Kingdom.
For Win 2000
Control Panel. ->Keyboard.-> Input Locales Tab. ->Add button->choose English United Kingdom & set this as default.
Hope this helps