Windows XP users should actively plan migration to the latest version of Windows for improved security protection.  AV-Test institute shares test results for about 2 dozen products that still support this expired operating system

http://securitywatch.pcmag.com/security-software/325620-xp-users-can-still-get-effective-antivirus-protection

QUOTE:  As of April 2014, Microsoft officially ended support for Windows XP. Those still using XP won’t get any more security patches. Well, there was one in May for an egregious Internet Explorer bug, but that’s not likely to happen again. An XP system without antivirus protection is a sitting duck, ripe for attack. On the plus side, the latest test results from AV-Test Institute show that many popular security products remain quite effective under XP.

AV-TEST May/June 2014 results for Windows XP SP3 for about 2 dozen products

http://www.pcmag.com/image_popup/0,1740,iid=425806,00.asp