Windows Server 2008 R2: User account set to not show on login
Solution 1:
There's a parameter in the registry to control display of accounts on the "Welcome Screen".
Dig down to "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon" and create a new key called "SpecialAccounts". Create a subkey of "SpecialAccounts" called "UserList". In the "UserList" key, create a DWORD value with the name of the account you want to hide, and leave the value of that DWORD set to 0. Do this for every account you want to hide.
Solution 2:
found this regedit configure much better.
open your "regedit"
HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS_NT\CURRENTVERSION\WINLOGON
step1: add a key folder named "SpecialAccounts" on Winlogon
HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS_NT\CURRENTVERSION\WINLOGON\SPECIALACCOUNTS
step2: add a key folder named "UserList" on SpecialAccounts
HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS_NT\CURRENTVERSION\WINLOGON\SPECIALACCOUNTS\ USERLIST
step3: add DWORD (32-bit) and name it the username that you want to hide and set it to "0"
note: you must disabled the "Interactive logon: Do not display last user name" so that the ADMINISTRATOR IS THE ONLY USER LOGON