I have the problem of the return address being 'lost' in Word after having run ccleaner. I tried to do as you suggested, but I have problems. When I go to try and exclude a registry entry, it doesn't seem to be listed. I select registry key, on browse, change to HKCU and type in HKCU\Software\Microsoft\Office\10.0\Word\Data\Settings, but OK is still greyed out - so I can't set it!