You can't keep Windows settings, personal files and apps because your current version of Windows might be installed in an unsupported directory.

I gave it up for time reasons (have to work...) - bought a new PC and attached the old PC's disk as a secondary disk to the new PC ...

Regards.

Hello,

We apologize for the late response. It is possible that the location of the program files is located on a different drive. To assist you with your concern, we suggest to change the registry which specifies the location of the program files. You can follow these steps on how to do this:

1. Press the Windows and R key on your keyboard to open the Run box.
2. Type regedit and press Enter.
3. In the Registry Editor window, navigate to: HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion
4. After highlighting Currentversion folder, check the Files if the Data shows as C:\Program Files.
5. If it is using a different drive, right-click on it and choose Modify.
6. Change the drive into drive C or C:\
7. Hit OK.

Perform the repair install again and check if the issue still persist.

Note: We just want to reiterate that we need to follow the steps carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restorationin case problems occur.

Let us know how it goes.

Regards.

I tried either using a USB repair disk (made from the same PC's settings/recovery/...) or using a disk made from the Media Creation Tool.

Sorry, that's a typo. Do not change it, it should be **C:**. We would like to know when you performed the repair install, did you use the Media Creation Tool?

We will wait for your response regarding this matter.

Hello,

I already did a check to the registry before posting my query,  and the values already pointed to "C:", as in the following picture:

Are you sure I should replace "C:" with "C://"? In the "ProgramW6432Dir" value only or in all the values? 

Regards