If you are a home user of Windows Vista you are most likely greeted by a welcome screen with available logins. This is not always what you would like and the CTRL-ALT-DELETE approach with a window for user name and password suits you better.
To achieve something closer to that you can try this, start gpedit.msc (as administrator)
Local Computer Policy
There you will find several policies for Interactive Login. Double click “Interactive logon: Do not require CTRL-ALT-DEL”” and set it to disabled.
This should allow you to login in without the fancy login screen you get by default in Vista.