Enable or Disable Secure Log On CTRL+ALT+DELETE in Windows 7

1. Click the Start Button
2. Type "netplwiz" in the Search Programs and files box and hit enter
3. Then the "User Accounts" Window Open
4. Click on the "Advanced Tab"
5. To Enable Secure Log On Check the "Require users to press   
    Ctrl+Alt+Delete"  box
6. To Disable Secure Log On UnCheck the "Require users to press    
    Ctrl+Alt+Delete" box
7. Click on "Apply" and Click "OK"
8. Now Log off /Restart the System. Then You can see the difference...and 
    Enjoy...