One of my colleagues has deleted the registry stuff related to the Administrator account on his PC and now he cannot see the "Administrator" account on the Windows machine!! There is just a "Guest" account which can be logged in[there is no switch user option]
So we tried to use "Run as administrator" option after logging in to the "Guest" account, the system does not recognize it either. It throws error or the button to click 'Yes' [to run as Administrator] is not getting enabled! Unfortunately there is no backup of the registry keys that were deleted. Can anything be done about this?!
Any suggestions about dealing with this will be extremely helpful as all his important files etc. are available on the other account. Thanks in advance.
edit: this is a Windows 7 machine