> Maybe this is a conflict with the button that HTTrack 
adds 
> to IE?  Perhaps try to uninstall the button or disable it 
> (not sure how, as I never installed that button).

Humm, maybe. There are plenty of weird things in IE, and 
notably compatibility problems between plugins.

You can try to uninstall WinHTTrack, then download the ZIP 
version of WinHTTrack, unpack it in a Program Files folder 
and run it.