How to prevent Windows XP from stealing my input Ctrl-Space which is meant for Emacs?

Question

I am learning and using Emacs. What I found annoying is that Ctrl-Space input will be stolen by Windows XP to switch the language bar instead of setting the mark in Emacs.

Answer 1

After looking at and trying out Richard C's answer with the regedit...

I found that, after changing all my key sequences in the language settings window, that the registry values specified above were already changed.... So without editing the registry, I restarted and the Ctrl-Space sequence was disabled!!

Moral of the story: If something doesn't quite work in Windows, RESTART!