Try pressing the left shift key, then the right. Could you have changed Styles by mistake to one that is all-caps?
From http://discussions.virtualdr.com/
From http://discussions.virtualdr.com/
Open a new document and go to Format | Font in the menu. Is "All caps" checked? If so, uncheck it and click on the Default button at the bottom.
Might try deleting normal.dot the defualt word template. Next time you go into word, it'll get recreated and probably without the ALL caps option enabled.