Thanks for the new suggestions once again. Unfortunately I am still seeing the error.
I ran the UE4Editor.exe as an admin and with firewall / antivirus disabled. I found the exe in this directory: C:\Program Files (x86)\Epic Games\4.10\Engine\Binaries\Win64 … I assume that was the right one?
I also uninstalled all of the .net framework files (about 10 different versions just sitting there) and reinstalled the latest which ended up being 4.5.2 and 4.6.1.
After installing, I tried running just swarm as an admin with no firewall and just the editor as admin with no firewall. I am still getting the same error in the swarm agent and the editor is still hanging up on “gathering scene geometry …100%”