Thanks for you confirmation that it's not going to be helpful to try and trawl through the registry - a job I wasn't looking forward to anyway!
Just on the unistall procedure, what would be the best way to do this? In the Device Manager and: remove all the drivers for related USB 3 entries, only selected USB 3 entries, or remove these by another process?
As you can see I'm a bit technologically challenged.
You sound confident that removing the driver may work, but as I posted earlier, I reluctant because if this doesn't work, I'm up the well known creek without a paddle.
Also, I'm wondering why the techs at ASUS didn't mention to do this?