It can happpen that you would need to edit the registery for a user, but regedit is disabled for the userprofile.
There is an option to open registery settings for another user as the administrator;
#1 Log in as Administrator and open regedit.
#2 Select HKEY_USERS and then go to ‘File -> Load Hive
#3 Browse for the NTUSER.Dat file from the user you want to edit the registery from. (make sure the user is not logged on)
#4 Enter the key you want to open, for example: HKEY_CURRENT_USER.
#5 When done, close / delete the hive.