passwords - Administrator account in Windows Vista

I have a Windows Vista (Home Premium) machine with a unique user for which the owner forgot the password. I have physical access to the machine.

I gave a try with the Ophcrack Live CD, but it couldn't find the password. Ophcrack showed me that two more hidden accounts exist (Administrator and Guest), with no password associated.

I tried to boot the machine in safe mode (with or without command prompt). Plenty of tutorials claim I should be able to select the Administrator account for login by using safe mode, but I still see the unique old user in the logon screen.

Is there a way I can login to this machine?

Answer

Use the Offline NT Password and Registry Editor and reset (clear) the password.