AutoComplete feature works with web addresses, forms and user names and passwords. The list of matches that the AutoComplete feature suggests for forms or user names and passwords on forms is stored on your computer and is encrypted to protect your privacy. Web sites cannot gain access to this information unless you submit the form or log in using the suggested password. To clear user names and passwords please select Tools


 then select Internet Options in Internet Explorer menu.



 Open Content tab on Internet Options dialog and click AutoComplete... button.

Click Clear Forms and Clear Passwords buttons to clear form data, user names and passwords saved in Windows Protected Storage area.

You can turn off these AutoComplete features here.