automatic correction I don't want

Tech-Archive recommends: Fix windows errors by optimizing your registry

This morning, when I type the letter

t

Word automatically corrects this to
't

(that is, apostrophe plus the letter t)

I don't know why this is happening and I checked in autocorrect to see if
there is something there to make this change. There isn't anything noted
there.

What have I done to create this problem and how do I fix the problem?

Thank you
--
Phyllis
.