Disabling the GPU might fix the problem, but since LR freezes when you click on the menu, you will have to do it outside LR.
Close Lightroom. With Windows Explorer, navigate to C:\Users\[your username]\AppData\Roaming\Adobe\Lightroom\Preferences
Open the file Lightroom 6 Preferences.agprefs in a text editor, like Notepad.
Close to the end of the file there is a line that says useAutoBahn = true, - change this to useAutoBahn = false,
Save and close the file. Now try to start Lightroom.
Try resetting preferences and then do a complete reboot (ie power off to the cimputer and back on). Windows 10 has a 'fast start' that causes problems after an update to the OS and this proceedure seems to sort that out.
If that doesn't do the trick, I'm sure others will come in with alternative suggestions.
Thanks very much for your kind replies, I tried both unfortunately neither of the two did resolve my issue
Meanwhile I rolled back the nVidia drivers as suggested, which did not resolve the issue. Not surprisingly since the later drivers did not interfere the proper working of LR until earlier last week.
Would anybody have any other suggestions?
I rolled back last week's W10 Update, that did not resolve the issue either.
So here I am, stuck with a piece of software that all of sudden does no longer work, no telephone support being available, or other ways that helped me solve this problem.
I guess it's time to start looking for a viable alternative.