Cleanup your computer and internet activity!
Clear Saved Passwords in Internet Explorer
Microsoft Internet Explorer (version 5 and later) has a feature that helps you remember passwords you need on Web-based forms. If the feature is enabled, each time you submit data in a form, the password is encrypted and stored on your local machine. The next time you need to enter that password again, IE will try to complete that password field automatically.
Anyone can extract all this information from the system registry and use it against you. It is strongly recommended that you always clean the AutoComplete data after using Internet Explorer.
You can use Easy SystemCleaner to remove your Internet Explorer Saved Passwords.