If you need to re-provision a PC and for some reason cant/wont rebuild the machine you can always do this:
Login to PC under an admin account…
- Open regedit and go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\
- Pick the profile you don’t want anymore and delete it.
- Then go to C:\Users and shift+delete their folder.
I’ve had a few cases where I’ve needed to reboot the machine in between those two steps. Otherwise, when you’re finished deleting the keys and folders you can logoff the admin account.