Regarding the VC++ files, I originally did download and run the VisualCppRedist_AIO_x86_x64.exe file you mention. I just re-ran it (as an admin) and it basically did nothing, so it looks like everything is up to date in that department.
I'll uninstall again as you suggested before and go through it all carefully once more, but we might be heading towards the traditional definition of insanity.
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