jfii

Thanks for everyone's help. Its pretty obvious its no fault of MB's You were the only ones who tried to help. 
I wasted a lot of time looking only at the admin events and cbs.log and not at full event "picture" which indicated the start of a disk failure and probably started the snowball.
I imaged the drive with clonezilla using its "recovery" option.
Of course i still had some currupted files
The files i was trying to recover were not in the standard build a cd  there had been and update applied
KB4571756 was one of the Win 10 2004 updates 

I was running 
    DISM /Online /Cleanup-Image /CheckHealth
    DISM /Online /Cleanup-Image /ScanHealth
    DISM /Online /Cleanup-Image /RestoreHealth
    sfc /scannow
    sfc /scannow
    sfc /scannow
In the time I spend attempting different options my restore points were overwritten. So I restored the drive from the image. 
I used DISM to reapply kb4571756 which it did. (example below)
    DISM /Online /Cleanup-Image /RestoreHealth /Source:wim:F:\Sources\install.wim:1 /LimitAccess
    (i actually had to extract the correct index into its own file for the wim:1 to work lost cmd in restore)
    DISM.exe /Online /Add-Package /PackagePath:X:\temp\Windows10.0-KB4571756-x64_PSFX.cab

The issue was still there so I began uninstalling anything that had installed a couple of days before I started having issues including windows updates and kb4571756 rebooted.
StateRepository was disabled through all so set it to manual
    Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\StateRepository\start =3 
I got a desktop but a spinning circle on the start/task bar - so with a ctrl-alt-del i was able to run a task manager and got to a command prompt again
Then ran :
    DISM /Online /Cleanup-Image /CheckHealth
    DISM /Online /Cleanup-Image /ScanHealth
    DISM /Online /Cleanup-Image /RestoreHealth
    sfc /scannow
    sfc /scannow
    sfc /scannow
CBS.LOG showed it fixed a couple of corrupt files but the errors I was getting earlier did not show.
rebooted and I am now at  Version 10.0.19041.450
My machine is now back working.

    dism /online /get-packages /format:table
    dism /online /get-packageinfo /packagename:"Package_for_KB4577266~31bf3856ad364e35~amd64~~19041.504.1.2"
    dism /Online /Remove-Package /PackageName:Package_for_KB4577266~31bf3856ad364e35~amd64~~19041.504.1.2
    
    
Resource 
    https://www.repairwin.com/how-to-remove-windows-updates-using-wusa-and-dism-commands/
    https://chefkochblog.wordpress.com/2018/02/24/fix-all-update-kb-related-issue-via-dism/
Thanks again