Outlook sends uninvited images as attachments

"Delete the folder: c:\documents and settings\username\application data\microsoft\signatures, then create a new sig in outlook. (it uses that folder)
Turn off ""Word as editor(1)"", test, revert change.. sometimes you just need to take office by the back of the process and shake it!
Have you made any changes to the normal.dot file for word?
Do you have any addons installed?

(1):""Utiliser Microsoft Office Word 2003 pour modifier des messages electroniques"""