[greencreeper]

Removing the US language from "Start... Programs... Microsoft Office Tools... Microsoft Office Language Settings" should be all that's needed. It's Word - does it's own thing a lot of the time. It's one of the first things I do after installing Word/Office. Some English words do use Z instead of S - the usual exceptions to the rule that you get in English that make it such a joy. Additionally, the idea that Z is American and S is English is a bit dated - both have become acceptable just so long as you remain consistant in your document.