Is it not the fonctionnality from Windows XP to choose the language your appliation can works ?
And is this not ALT+LEFT SHIFT and ALT+RIGHT SHIFT ??
Have you set several types ? (for me English, french, japanese)
You see the change by the two letters indicating the configuration country on the left of the tray icons. (for me EN, FR, JP)
for me, CTRL+RIGHT/LEFT SHIFT make nothing