The mystery deepens.
It seem the computer doesn't see the EFW or the built in USB hub of the ASI 1600 camera.
I uninstalled the ASCOM drivers for the camera and EFW and then re-installed them (Ran as Administrator).
But it still doesn't recognise them, either when the EFW is plugged directly into the laptop USB port, or when EFW is plugged into the camera USB hub.
Has anyone else experienced this before?
Thanks
Bo