Before we go too much deeper, did you look at the System Restore option in the first link? That might be the quickest and easiest if you have a recent enough restore point.

Other than that, yes, you'll need to find your backup. It will help a lot if you know the name of the backup file you created, or some part of the name, or its extension. For example, at the command prompt you can search for it by going to the root of the drive and then searching all subfolders e.g.

cd \
dir filename.ext /s /p
* or wildcard search such as
dir *.bkp /s /p

>I got to the Windows -> System32 -> Config > RegBackup folder but nothing there. So, the way I see it I need to find the backup I created.
>
>>In these articles the "command prompt" is what you get in the Recovery environment. I edited my first reply, you might try the second link there.
>>
>>>The URL/article says to get to the Command prompt. But I cannot get to the command prompt. All I can get to is RegEdit. Then, if I can find the Registry backup file I just created (a few minutes ago) maybe the problem will be fixed.
>>>
>>>>If you have a recent restore point, you might be able to use that: https://answers.microsoft.com/en-us/windows/forum/all/windows-10-changed-regedit-and-cant-login/d653eedb-f3ce-493a-a37a-b8e28790732b
>>>>
>>>>If that doesn't work there are other options at https://theitbros.com/restore-windows-10-registry-from-backup-or-restore-point/ , use at your own risk.
>>>>
>>>>>Hi,
>>>>>
>>>>>I am trying to make the Users folder to "Dmitry" from "Litva" The strange thing is that I see it correctly in the Windows Explorer and the Computer Management window. In those windows it says "Dmitry" And yet if I go to the command prompt and the folder Users, the only folders I see are Litva and Public. I find it strange that in one place it is Dmitry (the way I want it) but the actual folder name is different.
>>>>>
>>>>>How do I change the actual folder name from Litva to Dmitry?
>>>>>
>>>>>TIA
>>>>>
>>>>>UPDATE. I think I messed up my Windows 10 big time. I went to the registry and found the ProfileImagePath and renamed the folder name from Litva to Dmitry Now I cannot even log in into my PC :(
>>>>>
>>>>>UPDATE 2. I made a backup of the registry before I made the change. But I cannot even get to the Registry so that I can import the backup copy. Anybody knows how to get there? TIA