To make the option “Users must enter a user name and password to use this computer” visible on a domain joined Windows Server 2008 do the following:
1. Run the following comand in cmd:
reg add “HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon” /v AutoAdminLogon /t REG_SZ /d “1” /f
2. Click start, run. Write: control userpasswords2 and click ok to “open advanced user accounts control panel”.
3. Make sure “Users must enter a user name and password to use this computer” is disable. Click ok.
4. Specify username and password to use in autologon.
here is also interesting article about autologon http://www.logonexpert.com/freeautologon.html