How to: Delete a custom AutoFill list.
Solution:
Select 'Options...' from the 'Tools' menu. Click the 'Custom Lists' tab. Select the list to delete from the 'Custom Lists' list box and click 'Delete'.
NOTE: The built-in lists for months and days cannot be deleted.
1) Select the 'Tools' menu and select 'Options...'. (The Options dialog box appears.)
2) Click the 'Custom Lists' tab.
3) Select the list to delete from the 'Custom Lists' list box.
4) Click 'Delete'.
Deleting a list
5) Click 'OK'.