Ive managed to get it working, after doing something I have done several times before (so not sure why it worked this time:
1. In Device Manager, select USB Controllers or USB Devices (depending on where it is displayed) and right click > Properties > Driver Tab > Update Divers > Brows my Computer for Drivers > Let me pick from a List > (in the models displayed, select the latest date model) > Next.... Windows then tries to update, but fails. I then selected "back", unplugged the device, replugged it in and pressed "next". Windows then magically states that the Drivers were successfully installed. And suddenly the program worked.
Like I said, Im not sure why this has worked but Im glad this is over (for now).
Thanks for your assistance Alan
Kind regards