Based on the advice here, I switched UAC to Always Notify. Thanks again.
(My future plan, if financially feasible, is to upgrade to an SSD and then put the current HDD in a housing to use as a backup drive for system images.)
Upgraded to an SDD, but the 1.5 yr old HDD is inoperable. If my budget allows, I'll obtain another SSD and make monthly images to it with AOMEI Backupper.