No, I didn't use the AutoCorrect function. I don't recall ever using that function

. Here are the notes I made while I was performing the operation:
TO REPLACE STRAIGHT QUOTES WITH CURLY QUOTES
1. In Word 2000, click
Edit>Replace.... A
Find and Replace dialog box appears.
2. Click the
Replace tab and then click in the
Find what: field.
3. If
Format: Style: appears between the
Find what: and the
Replace with: fields, click the
Format button at the bottom of the dialog box, then click the
Style…. A list should appear.
4. Click
Style.... A
Find Style dialog box appears.
5. In the
Find Style dialog box, click
(no style) and then
OK. There should then be nothing between the
Find what: and the
Replace with: fields.
6. Click in the
Replace with: field and repeat Steps 3, 4, and 5. There should now be nothing below the
Find what: and the
Replace with: fields.
7. Copy and paste a straight open-quote mark into the
Find what: field.
8. Type or copy and paste a curly open-quote mark into the
Replace with: field.
9. Click the
Replace All button. When the process has completed, click the
Replace All button again just to be sure all instances have been changed. When this is completed, both the open-quote and the close-quote marks should all be curly.
10. Repeat this process for the straight apostrophe marks.