Make changes to a users system registry (Regedit) – Windows 2012
Log into the system as Administrator and open regedit.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
In this path you can see all users, and inside this you can see their profile path etc c:\users\test1
You will also see the user SID
This SID can be found in: HKEY_USERS