It's a faff, but as a workaround, open Lightroom's prefs (".agprefs") file with a text editor, and change "useAutoBahn = true", to "useAutoBahn = false".
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As you are not able to uncheck the graphic processor in Lightroom, you can try the following steps:
1.Open the RUN window, type devmgmt.msc, and click ok, it will open the device manager dialog box
2.Select display adapter from the device list and expand it
3.Right click on your Graphic card and disable it and keep the device manager window open
4.Launch Lightroom and try to uncheck the GPU acceleration and restart lightroom
5.From the device manager windows , please enable the graphic card again.
Let us know if its of any help.
Thank you for the replies I've had.
I was able to fix the problem.
Like I originally noted, I was not able to uncheck (untick) The "Use Graphic Processor" under performance because whenever I did it would crash.
When I loaded up LR at first it was in the Develop module. And I would quickly switch over to the Library module because if I didn't it would soon crash the program. It was then that I would go in and attempt to uncheck "Use Graphics Processor" and it would crash on that attempt.
I in inadvertently did not click on the Library module this last time but went straight to preferences and was able to uncheck "Use Graphics Processor" without it crashing.
So it appears the solution was to stay in the Develop module and make the change.
Thank you for your fast reply. I started to do this but found that file empty.
I have since fixed the problem by sheer luck.
Thank you so much for the quick reply. I was able to solve the problem as I noted in my reply to my original post.
It seems the failure was that I was switching out of the Develop module into Library before going to preferences. I went directly into preferences at first load and was able to uncheck it then. I had been switching out of Develop immediately on load because it would be soon there after that the program would crash.