It isn't that easy anymore to disable Windows from restarting the PC without notice.
I tried this:
In Win+R enter gpedit.msc
Step down to 'Computer Configuration' -> 'Administrative Templates' -> 'Windows Components' -> 'Windows Update'
There do as follows:
Set 'Configure Automatic updates' to Enabled
Set 'No auto-restart with logged in users for schedul...' to Enabled.
Set 'Allow Automatic Updates immediate installation' to Disable.
