logon failure the user has not been granted the requested logon type to this computer

[franance]

I recently added a password to the hidden administrator by mistake. Now I can't install or do anything on the computer which requires admin rights. I know the password is correct however when typed I receive the message "logon failure the user has not been granted the requested logon type to this computer". Every single fix for this issue requires you to run as administrator which I can't do even though the password I'm using is correct. I only have 1 user on the PC. The admin user doesn't show anywhere, so I can't log into admin and change my user's permissions. the 'local security policy' do

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