Computer Shuts Down By Itself After Free Upgrade

I used to run Windows 7, 64 bit. Then I took the free upgrade to Windows 10. It took me 3 or 4 attempts to get it to download and install.

Now my computer shuts itself down when it thinks I am away from it. My husband and I run a law office out of our home, and I cannot babysit the computer all day. I need it to stay on until I turn it off.

Here are my power settings:

Turn off display - 20 hours and 10 minutes
Turn off hard disk - 2340 minutes (39 hours)
Sleep - never
Power button - do nothing

But it ignores me. It still turns off my computer all by itself if I am not there giving it constant keystrokes or mouse clicks. Totally unacceptable. If I can't fix this by the 5th, I am going back to 7.

Then I was counseled to o to the ControlPanel/Power Options On the left side, click ‘Choose what the Power button does’, un-check ‘Turn on fast startup’ and save my changes. But that did not work either - it still shut itself down the minute my back was turned. It seems I am not the only one with this problem.