Because of big companies like Norton that have made a very suscessful busniness model out of the inept security (at firewall, code exploits....) that has been an integral part of MS since day one.
MS should close all possibliltys for attack, but that would put all virus protection companies out of business, thus The new Windows, although touted as the most secure cannot be and wont be
MS should close all possibliltys for attack, but that would put all virus protection companies out of business, thus The new Windows, although touted as the most secure cannot be and wont be