From the manual. I think the option you need to set is Execute Disable Bit to Enable, which is the default setting anyway.
Done those, Thank you for your efforts. Sadly, still not accepting W10.
I've enclosed photos of the two pages: The first is from the main menu, the second, the sub menu you imaged. As you can see, my set up is a wee bit different.

In the sub menu, I've set CPU Internal Thermal Control to [Auto] from Disabled.
When I bought this computer, I was with a fellow who had a brain the size of a planet and knew computers better than people. I was intending to get into some serious overclocking. The heat-sink on my CPU was originally for another machine, but I canalized it for this one.
The CPU Temp currently sits around 40C and never goes much past 55C. The CPU fan has never, as far as I know, needed to go much past 55%. So the heat-sink has done a good job.
Sadly, my friend became seriously ill shortly after and will never recover. So I haven't gotten into playing about with any of those settings.
Anyway, I have never actually been in that sub menu. And as you know, I have only now, with your encouragement, updated the BIOS. Rather disppointed the most modern I could find came from 2009, but there you go.