WHOOAA, this thread expanded quickly!!
Yeah, it definitely was the drivers and after numerous trials and errors with the live chat people. It was sorted, but then decided to flip out every so often regardless and she'd have to repeat the process of uninstalling everything Wacom related and I have a feeling she even had to manually edit/delete one of the files that came along because of an incompatibility every time. Needless to say, it was a bit of a nightmare and one which I've never seen happen to anyone else. I know the drivers can glitch out from time to time, but they're usually pretty easy to fix.
I don't really have much to add to the actual topic over all the knowledgeable people on here, but I've been pretty fortunate with Windows and not really having any issues myself. It
does annoy me to no end how they try to force these updates on you and even when you say no 100 times, it decides to do it for you. I know some of my family have had issues running W10 on their older spec PC, which I've tried to help with, but after every update, something goes wrong or has changed something you didn't want changed.
Anyway, enough digressing, I hope you find a workaround for it all Mouse and it seems there's some great info and advice on this thread for it!