windows vista "The User Profile Service failed the logon. User profile cannot be loaded" problem

just now i had a friend who came to me with a windows vista problem (well, vista itself is a problem to me lol)

when he tries to log on into his vista, an error which says "The User Profile Service failed the logon. User profile cannot be loaded"

a quick googling brought me here.

following the guide, i opened up regedit, change the current user's registry folder's name, and use the bakup registry folder instead. well at least this method works for my situation. if this method doest fix yours, try following alternative solution given on the provided link :)