The official UAC answer is here and very long.
As the only user of my machine and being some what knowledgeable concerning security risks, I choose personally to Disable the UAC plus run the machine under the Built-in Administrator Account for [ My Own Convenience ].
This is a Hand Built Custom machine and I have hard Drive Image Backups plus other software tools I can use to recover from almost any situation.
I do [ NOT ] recommend my way of running a machine to others as they might have important data on their systems which is critical not to lose.
It is a more of a "Do as I Say; NOT as I Do" situation. ;)
Sometimes I "slip up" and make inappropriate postings, when I see others struggling and frustrated fighting their own computer systems while trying to get their work accomplished.