I did some poking around and found a few videos with things to try, seemingly made some progress using them.
1.
https://www.youtube.com/watch?v=7ptSxGtYKK8 - How to Fix the ‘Unhandled Exception Has Occurred’ Error In Windows 10/8/7 [Tutorial
a. Windows Features & .Net Framework
Found that both the .net frameworks were enabled, but wondered in there was an install error. So unclicked the one he had in the video (.Netframework 3.5) and restarted. Then I tried the replay and there was a crash
but without the unhandled exception, it was just- boom- desktop.
Re-clicked the .Netframework 3.5, let the files download, install, and restarted. Upon testing using the same replay at 10x speed- zooming in as I remembered- and
it did not crash. This was good but I wanted to be sure.
So watched it again at 10x speed and clicked more wildly around. Near the 3/4 mark, it crashed but with a different error: "Deserialized nil table value."
This occurred as I was clicking on a units icon and hovering over the unit description.
Wondering- though if this is just because I was stressing things.b. Windows Resource Protection Found Corrupt Files...
The second thing he did was to go to the admin CMD prompt and using "sfc /scannow" . It found corrupt files but couldn't repair. Fortunately, the same guy had another video for that scenario, and after running the "Dism /Online / Cleanup-Image /RestoreHealth" operation (seemed to hang at 100% for a while), re-ran the SFC Scan, and this times window's reported corrupt files found but was able to repair them
I'm going to continue testing, but I was encouraged to make some progress. Nevertheless, I've attached the error information regarding the "Deserialized Nil Table Value", incase there's something else there...