locking CTRL+ALT+DEL with password

I'm not sure about it asking for a password, but here's a program that can disable someone from using that key combination.

Link

Here is another link that might be of use.

Link

If you are running XP Pro, you can also use the group policy editor (Run > gpedit.msc).

If you look under 'User Configuration\Administrative Templates', you could do the following:

- Enable "Remove and prevent access to the Shut Down command" under 'Start Menu and Taskbar' folder.

- Enable all options under 'System\Ctrl+Alt+Del Options' folder.

This would effectively remove all options when "Ctrl+Alt+Del" is pressed except the 'Cancel' button (which closes the Windows Security dialog box).

Note - this assumes you have the Welcome screen disabled forcing the Classic logon dialog.