Remove the Ctrl + Alt + Delete screen in Windows 7

Enabling the secure logon feature will make the Press CTRL + ALT + DELETE to log on screen to appear when you start your computer or when you perform the Switch user operation or when you log off. Also, you will see the Press CTRL + ALT + DELETE to unlock this computer screen when you lock your computer. Perform the following steps to disable the secure logon feature:
1. Click Start button . In the Search programs and files field, type netplwiz and press the Enter key from the keyboard (If you are prompted for an administrator password or confirmation, type the password or provide confirmation).
2. Click Advanced tab. Under Secure logon, click to remove the check mark beside Require users to press Ctrl+Alt+Delete.
3. Click Apply and then click OK.