When the Log on to Windows dialog box appears, you can control whether the Domain box and Log on using dial-up Connection appear. This can be toggled by the Options button, which alternately displays and hides them.

To control the initial display, use Regedt32 to navigate to:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

Double-click the ShowLogonOptions value name in the right-hand pane. This REG_DWORD data type can be set to:

0 - to hide the options when the dialog opens.

1 - to display the options when the dialog opens. This is the default.