Drat and double drat.
Just for clarity, there were three pcmcia.sys choices in my System32, a drivers\en-US, one just called 'drivers', and another called 'Driverstore\FileRepository' - it was the one just called 'drivers' that I renamed.
Also, in the build up to this over the last few weeks (and many many hours), I recently did a clean install of Win10 Home using the MS media creation tool (the machine was previously Win10 Pro) and after managing to coax one of the network adapters back into life and babysitting through numerous updates I am presently at Version 1709, build 16299.248.
Hope this helps.