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Try unchecking Use Graphics Processor in Camera Raw Preferences. (Ctrl + K)
Thank you kindly!
Which type of computer and graphics card do you have? (Note: if it's a Surface Book or new Surface Pro, make sure you have the latest Windows 10 update. The initial Intel 520 drivers had a bug that would result in exactly the symptoms you show in the screenshot. Fixed with the latest drivers.)
Now I can activate the GPU option successfully.
Where Intel GPU 530 driver 22.214.171.12431 (Windows 10 Pro - 64bit, version 10.1.10586) and camera raw 9.4