Open your registry and find the key below.
Create a new DWORD value named "Administrator" and set it to "1" to allow the
administrator account to be show on the logon screen
Restart Windows for the change to take effect.
Key:[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\
CurrentVersion\Winlogon\SpecialAccounts\UserList\]
Value Name: Administrator
Data Type: REG_DWORD
Data:(0 = disable, 1 = enable)
