I tried the solution here and also
Login to the system as an user who is in the administrator group. It should be a different user from the one that you are trying to change.
Open File Explorer and navigate to C:\Users folder. Rename the old folder corresponding to the old user account
But I am not even able to rename the folder.
I shut down, restart and login as the other Administrator, and it says the folder is still open and will not allow me to rename it.
2 Answers
Most likely (but untested here) reason is that the folder is being guarded/accessed is its designation as a profile folder. The tutorial from TenForums edits the HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\<*User SID*> path before renaming the folder.
A simpler way to fix Microsoft's mess is to create a hard directory link.
CMD as admin:
mklink /J C:\Users\myful C:\Users\MyFullNameThe user folder myful will still be there, but you can ignore it.
