Guyz in this article i'm going to show you that how to enable or disable CTRL+ALT+DELETE before log on in windows 7.
Steps for enabling and Disabling--
1)Click Start button.
2) Type netplwiz and Press Enter
4) Click Advance.
5) Then in bottom of menu you will see " Require User To Press CTRL+ALT+DELETE " click on its radio button Require User To Press CTRL+ALT+DELETE .
6) click Apply.
7) For Disabling it follow the steps once again.