I've run this SFC command before I attempt the upgrade - up to 12 attempts now. I also run the following three DISM commands from the Admin Command Prompt window:
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /RestoreHealth
No errors found after running all four, so I should be good to go with respect to corrupted files, right? I've attempted the upgrade via Windows Update, the Media Creation Tool, and extracting and running the ISO from a root drive location.
I disable all StartUp programs and services that aren't Windows-related (clean boot).
I've deleted everything in C:\Windows\Downloads.
I've uninstalled MalwareBytes and my virus programs just before attempting the upgrade.
Nothing works so far, and I've wasted many hours in the process. I've even solicited Microsoft's help via their online Technical Support chat. Of course, they went through the exact same processes I mention here; and, after two hours with them, the installation
failed with the exact same error I received. So, they escalated to Level 2 support; and, so far, no one has been able to resolve and get Windows 10 installed.
The only method I haven't tried is creating a bootable USB drive using the 64-bit ISO downloaded from Microsoft's site. I'm creating that on a 32gb flash drive as I type this. It's taking awhile because I'm checking for bad sectors first, to be safe. I'll
come back and let you know if it works this time.