Internet Explorer (V 6)

If you do not want to save the image but do want added security:
Tools - Internet Options - Advanced - Security - Do not save encrypted pages to disk should be turned On
Then click apply. If you are working on your own PC reset the security settings after use.

Tools - Internet Options - Advanced - Security - Do Not Save Encrypted Pages should be turned On

Passwords:
Tools - Internet Options - Content - Autocomplete button -
Either click clear passwords after use or make sure that the User name and passwords on forms is not ticked
Tools - Internet Options - Content - Autocomplete buttonEither click clear passwords after use or make sure that the User Name and Passwords On Forms is not ticked.