Please click on Lightroom option from the Library Module, then go to the Preferences.
Please go to the Performance Tab and uncheck the option for " Use Graphics Processor".
Restart lightroom, and check if it works.
Please let us know if it helps.
James can't open Lightroom - so how can he change a setting in the Library module?
James, any error messages? Have you tried reinstalling?
You are correct Keith... I could not open LR6
.... so I could not do what Tanuj had suggested.
What I had to do was download the adobe application manager and install that... for some reason it was missing.
Thank you for your help.