How can I prevent Internet Explorer from prompting users to save User Names and Passwords?

To prevent Internet Explorer from prompting users to save User Names and Passwords, you can enable the Do not allow AutoComplete to save passwords Group Policy at User Configuration Administrative Templates Windows Components Internet Explorer.

When you enable this policy, it disables the automatic completion of user names and passwords in forms on Web pages, and prevents users from being prompted to save passwords. The User Names and Passwords on Forms and Prompt Me to Save Passwords check boxes are dimmed on the AutoComplete dialog of the Internet Options / Content tab.