Some users asked me how to remove the requirement for users to press Ctrl Alt Delete on the logon screen if this setting is greyed out.
When you try to clear the ‘Require users to press Ctrl Alt Delete‘ checkbox in the Advanced tab of User Accounts window, you’re unable to because this setting is greyed out as seen in the picture below.
Solution:
Login as an Administrator or with a user that has Administrative rights.
Click Start | Settings | Control Panel | Administrative Tools | Local Security Policy
In the left pane browse to Security Settings | Local Policies | Security Options
In the right pane change the value for, “Interactive Logon: Do not require CTRL + ALT + DEL” from Disabled to Enabled
Restart the computer.