Using Windows7 is very different from Vista, including the sign-in feature to authenticate the user. The ctrl-alt-del feature is missing from the screen so anyone can access the computer. But there is a simple way to put that feature back on line. Follow the next few steps to enable that feature.
Go to the start icon.
The next step is to use the search and type the netplwiz command.
The User Accounts box opens with two tabs: Users and Advanced.
Next select the advanced tab.
The secure logon feature will now be enabled when you check “require users to press Ctrl + Alt + Delete.”
This is nominal security to be sure, but if you want it enabled, it is easy to do.