After dozens of successful upgrades, one of the last machines is causing me issues. The upgrade from Media Creation Tool appeared to be progressing normally. When Windows 10 finally came online there was a popup box notifying me that the computer could not be upgraded, however I was presented with a Windows 10 login screen. When I entered the username/password the screen went blank with only the cursor arrow. I have tried logging in as both the domain user and the local admin user but without success. I was eventually able to boot into Safe Mode with the intent of rolling back to Windows 7. However, I cannot get into "Settings" as when I right click the start menu and select "Settings" nothing happens. I attempted to start Settings by running ms-settings: but get "This service cannot be started in Safe Mode". The Start menu does not even work.
I have tried running sfc /scannow but it finds no integrity violations. I have attempted a startup repair from a Win 10 boot CD but it also could not find any problems.
Is there an alternative way to revert to Windows 7 besides going into Settings?