So being down with a broken foot the last two weeks, I decided to upgrade the next to last Windows 7 PC on my home network. This is my primary use / gaming PC (originally running Windows 7 Pro). OS installation was fresh (not an overwrite or upgrade) using one of my valid Windows 7 Pro keys from an obsolete installation. Installation package extracted from Microsoft ISO download and the latest update released in November 2015 (rev 1511 if memory serves me correctly). Electronic digital entitlement and activation went fine. In fact every step of the change from Win7 Pro to Win10 Pro went off without a hitch.
I've worked through the minor System Event critical error notices (mostly DCOM related) and for the most part the machine is doing everything splendidly. However, last night I was changing my UAC account control from "minimal interruption" to "no interruption" and the machine just hangs for 3-4 minutes not allowing me to select the "Yes" option to select the changed setting. Eventually it will take, but I'd sure like to figure out what is causing the hiccup.
Wondering if anyone else has noticed similar behavior. This is my sixth Windows 10 Pro installation and the only one that exhibits this behavior.