Default User login on Domain (Windows 7)

To do it on the PC, run gpedit.msc, browse to 

Computer Configuration >>
     Windows Settings >>
         Security Settings >>
             Local Policies >>
                Security Options
and look for 

'Interactive login: Do not display last user name' and set it to 'disabled'.
'Interactive login: Display user information when the session is locked' and set it to 'User display name only'.