To get the classic XP style login where the user must input their username and password every time, some settings can be changed in the Local Security Policy.
Open the Local Security Policy management console. Open Control Panel->Administrative Tools->Local Security Policy. You can also do Start->Run->secpol.msc
Expand Local Policies->Security Options. Set Interactive Logon: Do not require CTRL-ALT-DEL, and Interactive Logon: Do not display last user name to Enabled.