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Could you try turning off Photoshop > Preferences > Camera Raw > Use Graphics Processor and restarting Photoshop?
That the OS freezes indicates a problem outside of Adobe’s applications – driver, OS, hardware, …
As fro rolling back ACR you may want to post on the Camera Raw Forum.
Thanks that worked, will see how I get on
Turning off »Use Graphics Processor« in the Performance Preferences is no proper solution as it invalidates GPU dependent features (like the Rotate View Tool for example) but it indicates problems with the GPU driver or the OS.
You could also try turning it back on and turning it off for ACR specifically (Photoshop > Preferences > Camera Raw > Ue Graphics Processor).