How to change the dictionary language?

hello,

how do I change the dictionary language to English UK? I keep trying, but whenever I do, it switches back to English US as soon as I close the spelling/grammar window.

in word? make sure your windows language is set correctly, as it picks it up from there i believe

how do I do that?

I've gone into the regional controls, then clicked details, and removed US english, but what else do I have to do?

u need to restart for it to take effect i believe

HAVE YOU CHANGED ALL TEH STANDARDS AND FORMATS, AND ALL THAT KIND OF THING? BASICALLY, CLICK EVRY BUTTON IN THE REGIONAL OPTIONS (ALL 3 TABS) AND CHANGE THEM TO UK

Ive been playing oblivion, so that was in caps, but i cant be bothered to re write it.