Can't Run SFC Scannow (Windows 10, Dell XPS 8500)

Solution 1:

I have also attempted to do an in-place windows upgrade but that resulted in it eventually checking for updates and hanging forever around 60% and never progressing anywhere

Try again a Windows 10 Repair Install.

Go to the Media Creation Link:

https://www.microsoft.com/en-us/software-download/windows10

Windows 10 is running, so click on the Download button (not Upgrade Button) and select Run. If the Repair will not run as per above, use the Download button to create a USB Windows Installation key, then run Setup on the USB Key.

This will launch the Repair and proceed normally.

If this fails to run properly, then you need to back everything up and re-install Windows.