I can't seem to find anywhere to do that. It seems strange that you are not allowed to give the new user a "Name" at the point of creating it, but that was not an option.
Remember, I'm only enquiring why it appears as Karen_000 in c:\users and trying to ascertain how that is determined.
The attached shows what options are available when the user goes to control panel/users
You are allowed to choose a name during the setup, however, you opted to use her Microsoft account on the machine. The username "Karen_000" was taken from her Microsoft account.
This is actually set up like this on purpose. his is set up on purpose so that programs that dont use environmental paths will still function.
For example if I create a user account on my computer called "Alex" and I start to install all these programs that stores files inside the C:\users\Alex, then I go and rename the account to GoThePower all these programs will still be looking for the old account path. This is not an issue with Windows though, Microsoft had to make it this way because of the way other company's would code their applications. If you see the following files for example before renaming my user account the paths would be:
C:\users\Alex\Desktop\Fungame.exe
C:\users\Alex\Music\SuperCoolSong.mp3
Now if I rename my user account to GoThePower and Windows did rename the C:\users\Alex folder to C:\users\GoThePower, You would come along to launch your FunGame.exe and the program will start looking for this .exe file inside C:\users\Alex\Desktop\Fungame.exe as that was where it originally installed too. But of course it will not be able to find it because the new path of this file is called C:\users\GoThePower\Desktop\FunGame.exe, and all sorts of errors will come up saying the file can not be found etc. This is one of the reason's why Windows does not rename the folder.
Now take the other file C:\users\Alex\Music\SuperCoolSong.mp3 and this is stored inside your Music player with the above path and you rename the account to GoThePower, your music player will not be able to find your song that you previously had and would report it as missing or deleted.
Using Windows System Restore would be your best bet to fully remove the new unwanted user account. Choose a restore point prior to the creation of the new user account.
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