I have seen this problem a couple of times: the user can't log in and gets a "The User Profile Service failed the logon" message. The cure is to swap the registry entries relating to the profile and its backup.
But if the locked-out user is the only administrator there is a problem. On this laptop I had to
(1) Boot from the built in Windows repair (equivalent to booting from the Windows DVD) and start a command prompt.
(2) Run regedit to edit the registry to enable the built-in administrator account (http://www.sevenforums.com/tutorials/102552-built-administrator-enable-winre.html)
(3) Log in with this account and fix the profile (http://support.microsoft.com/kb/947215)
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