Microsoft introduced Windows XP in 2001, and it became an instant success. In 2004, Microsoft unveiled Windows XP SP2, which featured a built-in, always-on firewall that effectively ended the era of the large-scale Internet worms, such as Blaster, Sasser, and Slammer. Windows XP was affected by 75 of the vulnerabilities, including 68 rated critical, which accounts for 64 percent of total vulnerabilities and 90 percent of critical vulnerabilities this year alone. By mid-2014, new and unfixable security flaws for XP will be well-known and freely traded in the cybercriminal underground.”]