The DOS based Windows didn't have any security and that logon box carries none. It's a network signon item and not a computer logon.
Try a BIOS password if you must.
Upon startup, the security sign on box/template appears asking for a password. The template also has a Cancel box which upon activation allows the system to continue loading without a password entry therefore computer operation is not password protected. What other security measure offered by Windows (if any) is available to keep youngsters from accessing the computer?