Sigh...
It doesn't autofill anything. That is your current directory. You can then use the change directory command, CD, to change to any other directory like I did here with Windows.

It appears that the issue here is that, if you don't have the experience to understand command prompt basics, and be able to follow my instructions to do a copy/paste of commands, then this problem needs to take a different path.
Research on the internet points to user profile corruption as the source of the 0x800401E5 errors. I had hoped that I could figure out what was wrong and get it fixed so that you didn't have to "start a new account and spend 3 days copying/syncing files".
Since you commented that "Yes to Security – all users on the system are listed", I wanted to start with that. All user accounts would not by default be granted access to your user folder. That says that someone was modifying permissions. The problem with that is that we forum users have no way to know what all has been changed on your PC. Either by you or by someone else. This forum does not lend itself to troubleshooting errors where there may be multiple problems, not all of which may be readily apparent.
I have this neighbor, and every time he has a problem with his PC, he calls me on the phone and tries to explain what he did and what his problem is. In almost all cases I tell him to just stop. Then I walk down to his house and sit down in front of his pc and look around and see what he has done. He just doesn't have the experience that I have to be able to "see" things and recognize that something is not right. It's just a whole lot easier that way.
I think that you would benefit from having someone who has a decent amount of Windows support experience to sit down in front of your pc and have you explain to them the history of your pc. Who was working on it, what they installed, why the permissions on the Users folder got changed, what other permissions were changed, when this problem started, etc.
Do you know anyone or maybe a friend of a friend who could look at your PC?
Sorry.