Can you log into Windows 8.1 with an administrator account? If you can login (know the password) is the account an administrator account? If it is an administrator account i/e user name joeblow with administrator privileges hold the shift and control keys down together and open the command prompt not releasing them until the CLI opens. At the elevated prompt type: net user administrator \active:yes This will activate the default passwordless account used for Windows installation. Restart and try the options again.
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