When I go into "R&L Options" there are two tabs:  "Regional Options" and "Languages".

Try  this when Office and Outlook are closed.
Click on "Languages" Tab.
Then click the "Details" button.
Then click the "ADD" button.  [ The "Settings" tab ].
Then click the upside-down-^ under "Input languages" and a pick list of languages should display.  Choose your language and click OK.
You should be back at the "Settings" Tab.
Choose your language in the "Default input language" in the upper half of the window.
Click OK.
Click Apply.
Click OK.
Reboot Windows XP.