Hi Brink,
I just tried your reg fix and yes, it brings the option back up in the advanced settings but it doesn't have any effect.
My laptop is a HP Compaq 6710b core 2 duo T7500 2.2GHz 3GB RAM now running Win 8.1 update.
It was working fine in Win 8 but not in the Win 8.1 update.
I have...