To reset password:
Troubleshoot. Then go to Advanced options. Then go to Command Prompt.Utilman.exe.
copy c:\windows\system32\Utilman.exe c:\windows\system32\Utilman.exebackup
cmd.exe to Utilman.exe
copy c:\windows\system32\cmd.exe c:\windows\system32\Utilman.exe /y
Continue.cmd.net localgroup administrators
Set new password.
net user <Username> *