Having performed some dastardly deed in a previous life I have just had to set up my daughters new (XP home - yuk) laptop.
One problem was she likes to handwrite (to a tablet) but I had nightmares trying to get it to work - eventually found that "Text services" in control panel sets the language!
Have you tried looking in there yet?
If your answers "Yes" then I'm afraid I haven't a clue.
Best of luck