AutoComplete

A feature of the most recent browsers allows them to remember information filled into forms previously on the site. The type of information remembered will range from name, address, usernames and passwords. We recommend you do not enable “usernames and passwords on forms” as this would allow another person using the computer after you to gain access to your online accounts.

To disable AutoComplete:

Select: Tools » Internet Options » Content tab »

Click on "AutoComplete" »

Uncheck the following:
Web Addresses (optional)
Forms
Usernames & Passwords