Browser False Security pop ups Even on windows Ten For browsers even fire fox !

Had manny false security alerts !!!  On all browzers all  windows XP > Vista > windows Seven > Even on widows Ten  !  When click them off they still down load on me crash my Sytstems ? web root > norton i have 360 >   Ad Aware !  All got busted !  There was one man out there > had router scanner runs numbers your router gain acess to your  network then brakes in  to your computers ?  Nothing realy safe !!!!!  bronzelion