This tweak allows an account that is normally displayed on the Welcome screen to be hidden from view. To log on using the account it’s necessary to use the Log On To Windows dialog box similar to the one in Windows 2000 i.e. press CTRL+ALT+DEL twice.
[Start] [Run] [Regedit]
Go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon\SpecialAccounts\UserList
Modify/Create DWORD Value of Data type REG_DWORD Named [Type Name of Account to be Hidden]
Setting for Value Data: [0 = Account is Hidden / 1 = Enabled]
Exit Registry / Reboot