hi people I would like to add my opinionMicrosoft for sure is a big international business company my opinion is (if they wanted to prevent any virus or Malware from entering their systems then, they absolutely can )BUT : Business plays its role here .. they make systems and others make security and that is done by an agreement Business is Business ... we can not ignore that Microsoft is the most popular business name in the whole worldthey have the most talented people then how come they can not secure their systems .... THEY CAN but business above everything and for sure .. that kills me thanks