Is anything different about the USB connections on the Desktop compared to the Notebook: Different speed USB2vs3, different things plugged-in other ports, one using a USB-hub one not, different cables, different cameras? If everything else is the same, then I’d expect something is off with the USB drivers on the Desktop.
The Camera-connection component in LR is written by Nikon. The one in C1 is written by C1’s authors so may act different.
There are not many things different between connecting the camera to the notebook and connecting it to the desktop.
- same camera
- same cable
But, one important point you have mentioned the made me remember. I have also tested 'NIKON Camer Control Pro 2'. It, same as Lightroom, does not find my camera. I really wonder how the manufacturer's own software does not work while a 3rd party solution does. Kind of emberrasing, at least it appears to me so.
So far I have tried to update every possible driver of my system. Everything seems to be up-to-date.
Is there a piece of S/W, that has no malicious background, that scans a systems and recommends the best driver for the different components? To verify that I have not overlooked something.
The only time I've ever messed up my USB drivers, on my older computer, was when I installed a driver-updater program, so I cannot recommend such a thing.