Peter.
May I ask what graphics card you're using and how did you select the driver? The reason I ask, if you asked Nvidia to scan and select a suitable driver that may have been your problem. I did this initially and finished up with problems.
I'm using a Geoforce 640 and to get drivers that worked OK on my 64 bit version of Win 10 I went to Nvidia selected Drivers and did a manual search making sure I selected Win 10 64 bit as my OS. This gave me a different driver to the one suggested by the Nvidia scan, which I'm guessing was primarily a Win 7 driver.
As I mentioned previously I have a minor problem with Lightroom 6, but on doing a search many others also have this problem dating back from the early days of Lightroom on various version of Windows.
Harry
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