I didn't have time to read the full thread earlier and just went by the thread title - it was certainly persistent.
Have the OP run FreeFixer to get rid of any SuperAntiSpyware residue and that should resolve those SAS errors.
http://www.freefixer.com/Other files that are shown as not found and can be selected, then those are safe to remove as well.
Have the OP copy & paste the cmd in this article to an elevated cmd prompt and that should sort any VSS problems.
https://justworks.ca/blog/fix-event-513-capi2-errors-during-windows-backupThis article is to resolve a specific one of the DCOM 10016 errors but the same principles can be used for the other keys in the other DCOM 10016 errors.
https://www.kapilarya.com/fix-event-10016-error-the-application-specific-permission-settings-do-not-grant-local-activation-permission-in-windows-10I assume his Internet is working okay now ?
Even though the sfc /scannow came back clean, have the OP run this cmd -
dism /online /cleanup-image /checkhealth
and if that says the volume is repairable then enter this one -
dism /online /cleanup-image /startcomponentcleanup
That one can take a while to run, then finally run this one -
dism /online /cleanup-image /restorehealth
While this one can look as if it hangs at 20%, it will complete but if it returns it cannot find the source file, then I think a repair install will be the way to go.
If the OP hasn't created a Win 10 install disk then he can by hitting the Download tool now button in
https://www.microsoft.com/en-gb/software-download/windows10 after reading the section in how to create installation media.
You'll probably know how to do this but with the machine booted up, open Windows Explorer - This PC - insert the media then double click on the drive to start the process.
I don't know which is providing the Firewall - Avira or IObit Malwarefighter but when I was using Norton Security, I used to disable it before performing a repair install, so it may be best to advise the OP to disable those first.