MSN LOGIN SCREEN

I HAVE WINDOWS XP PRO AND I USE MSN MESSENGER VERSION 7 , WHEN ANY1 LOGS IN USING THE HOTMAIL PASPORT ON THE MSN MESSENGER THE EMAIL ID STAYS THERE AND RECORDED IN THE USERNAME SIDE, I DO NOT WNT THAT TO STAY WHENEVER ANY1 SIGNS IN HE HAS TO TYPE THE USERNAME AND NOTSTORE THE ID ON THE SCREEN. HOW DO I GO ABOUT THIS. ANY1 HELP ME ON THIS