Adding Ctrl+Alt+Del requirement and pre-login message in Windows 7

Here is a blog article showing how to configure that option using the Group Policy Editor :

• http://www.mydigitallife.info/enable-press-ctrlaltdel-secure-logon-on-windows-7-or-vista/

You'll need to use method #2 (Run secpol.msc, expand Local Policy -> Security Options), and change the policies:

• Interactive logon: Message text for users attempting to log on (Make this Enabled and enter your desired message)
• Interactive logon: Message title for users attempting to log on (Make this Enabled and enter your desired caption)

in addition to

• Interactive logon: Do not require CTRL+ALT+DEL (Make this Disabled, instead of Not Defined, in order to require CAD)

as mentioned in the post.