HELP NEEDED - Changed User name and lost administrator priviliges

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Sep 21, 2006
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Please help if possible, running Windows 7 Professional, changed the Username under "Add new users to your computer" and now am getting an error message "No mapping between account names & security IDs was done"

I have not put any password into the system, just changed the user name from joint names to a single name.

Scared to reboot as I don't think I'll be able to log on again.
 

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