Are you saying that Word automatically capitalizes i ? That's because
it thinks you mean the word "I," meaning 'me'. That's because it's an
AutoFormat As You Type or an AutoCorrect entry -- to undo it, press
Ctrl-Z as soon as it happens; or if you notice it later, arrow back to
it and a heavy line will appear under it. Click on that line and
choose Undo, or else choose the option that says something like "Don't
capitalize i" (if it's there), or the option that refers to some more
general kind of automatic capitalization, and it won't do it any more.