Requiring Ctrl+Alt+Del on Windows Vista
In many situations, and for me out of the box, Windows Vista can rely on its Welcome screen and doesn’t require Ctrl+Alt+Del security login. Do you want to or need to enable this functionality on Windows Vista if you don’t have it?
Click Start | Run, type NETPLWIZ (assuming you are logged in as an Administrator).
Note: If you have not yet added RUN back to the Start menu, right click the start button, go to Properties, go to the Start Menu tab, click Customize. All of the options are in alpha order, so scroll all the way to the check the box for the Run command. I live by the Run command, so not certain why it wasn’t there by default.
The Advanced User Accounts dialog box should open. Click the Advanced tab, and in the Secure logon section, check the box that says “Require users to press Ctrl+Alt+Delete”.
Registry setting:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Set DisableCAD to 0.