New Chinese AV Vendor QIHoo, Kaspersky, and Bitdefender recorded perfect scores in latest tests for Windows 7 64 bit O/S as noted in review AV-TEST review.

http://securitywatch.pcmag.com/security-software/321857-chinese-antivirus-qihoo-360-earns-top-score-in-independent-test

http://www.av-test.org/en/tests/home-user/windows-7/janfeb-2014/

QUOTE: Chinese Antivirus Qihoo 360 Earns Top Score in Independent Test. Last time around, Qihoo earned 5.5 points in each category, for a total of 16.5. This time it took a perfect six of six points for protection, and usability, raising that score to 17.5 of a possible 18. Bitdefender and Kaspersky tied that score. McAfee, Norton, and Trend Micro came very close, with 17 points each.