if you want to open CMD without log in you can replace UtilMan.exe with copy of cmd.exe (renamed to utilman.exe), then you can open command prompt by clicking Ease of access button at logon screen.
it has to be done by linux live CD or another OS, by this way you can then change password of any account via CMD or open any program without having to log in (all proceses will be opened by SYSTEM account)
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