(DISM / SFC) step 1-2, and 4 completed however step 3 failed, source
file could not be found. Anyways, ran step 4 and it was successful,
restarted computer. Same error.
This means more serious operating system errors and/or perhaps a Windows User Profile error.
Start with a Windows 10 Repair Install to see if that works.
Go to the Windows 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. This will launch the Repair. Proceed normally answering the prompts. The default Keep prompt is to Keep Everything.
Try Keep Everything and test.
If that option does not work, then the damage is more serious.
In this event, back up everything and reinstall Windows.