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#21
Try running System Restore from System Recovery Options from booted Win7 installer. Go back to a Restore point before the problem began.
If this isn't possible try the fixes here: You receive a "The User Profile Service failed the logon” error message
If this doesn't help then you might be able to boot into Hidden Administrator from booted Win7 installer Command Line: Built-in Administrator - Enable from WinRE - Windows 7 Forums.
If this succeeds create a new Admin account to copy your data into, then delete the old one then hide the built-in Admin account again.