Win 10. Business client. CANNOT WIPE and Reload! They have obscure software that they cannot reinstall

I imaged and fabs'd a 3 TB Seagate drive that is showing errors on the drive.
I have cloned the drive, which completed without error, but after 2 cloning attempts I get the same error:
"Your PC needs to be repaired.
A required device isn't connected or can't be accessed."
Error code: 0xc000000e
I've booted from a Win 10 USB to run bootrec.exe.
Running bootrec /fixmbr is successful, but I get an "access is denied" error trying to run bootrec.exe /fixboot.
bootrec /rebuildbcd finds 1 Windows installation but if I type "y" it errors with "the requested system device cannot be found".
iv'e run diskpart with:
sel disk 0
list vol
sel vol 0
assign letter = C
exit
cd /d :\EFI\Microsoft\Boot returns error "the system cannot find the path specified"
bootrec /fixboot give Access denied error again
It's a GPT partitioning scheme with C, (Windows RE) D (Windows) E, (unassigned) F, (Recovery Im), System (unasigned), G (Unasigned hidden) H, Unasigned.
Any help appreciated.