Error 8506 421 keeps coming up. I have windows 7 professional and am current with all updates

Error 8506 421 keeps coming up. I have Windows 7 Professional  (Toshiba satellite laptop) and am current with all updates. I have followed the many suggestions to remedy the situation however none have worked. I have used the Norton Removal tool, the Norton eraser and the rebootable recovery tool, none of worked. I have re installed the product (Norton 360) 3 different times and keep getting the 8506 error. My system indicates that no anti virus software is on my computer !

Error 8506 421 keeps coming up. I have Windows 7 Professional  (Toshiba satellite laptop) and am current with all updates. I have followed the many suggestions to remedy the situation however none have worked. I have used the Norton Removal tool, the Norton eraser and the rebootable recovery tool, none of worked. I have re installed the product (Norton 360) 3 different times and keep getting the 8506 error. My system indicates that no anti virus software is on my computer !