I think I remember seeing a detailed write-up on this somewhere. You have to boot into a recovery mode console and use RoboCopy to move the user profile folder(s). IIRC you cannot move existing profiles while Windows is running.The registry change will not affect existing user profiles.If you have existing profiles you want to move, it becomes much more difficult, because Log in with the 'real' admin account and delete the temporary / dummy account you created during install.Make sure at least one of these has admin rights.
HKLM\Software\Microsoft\Windows NT\CurrentVersion\ProfileList.
I believe what you want is the registry key
