By default, Windows XP and Internet Explorer 6 will examine what you are typing in the address bar and pop up a list of similar entries you entered recently. It also stores entries you have made on web documents and forms, including usernames and passwords. While this can help speed up your web surfing experience, it can also potentially compromise your privacy if multiple people are using the same user account on your system. Fortunately, autocomplete can be easily disabled through the IE options menu.

To do this: From Internet Explorer, go to the Tools menu, then select 'options.' Choose the 'content' tab, then click the 'autocomplete' button.

Disable the various options as you see fit. You can also clear autocomplete's memory cache for web forms and passwords from this window.