From the screen shot. You did not run as Admin.
try reagentc /enable again
backup with CloneZilla on my wife's for normal backups, EaseUS ToDo for all other backups and always have a third option for cloning when I use the SATA board to USB 2.x/3.x to connect to a new drive and then use a Cloning disk that I keep just for those special occasions when you have ran out of options.
My eyes are really killing me, so it is hard to see the info in the two Command windows. Are you up to trying TestDisk to see if you can rescue the Partition table, as long as it is not corrupted? https://www.geekyprojects.com/storag...-table-or-mbr/
Hiren's has always been the go to for everything on a disc/USB key toolbox. http://www.hiren.info/pages/bootcd