I just want to ask this:

My Secure Logon (you know, the one that requires you to press Ctrl + Alt +
Del) is by default turned off. I want it enabled so I tried the Help and
Support section. But it turns out that the checkbox in which "Require users
to press Ctrl + Alt + Del" is disabled. I only use one administrator account
with password (not the built-in administrator which is turned off by
default). My OS is Windows Vista Business.

Thanks in advance..