Summary
Kaspersky Internet Security 6 keeps viruses and spyware off your system with powerful real-time protection and scanning. Its firewall goes beyond the basics, protecting against malware-style leak-test techniques (but also warning against some innocuous programs). As with many security suites, its weakest element is spam protection.

Pros
Antivirus scans files on access and scans e-mail and Internet traffic. Skips unchanged files to speed scanning. Firewall's Proactive Defense blocks malware-style leak tests.

Cons
Proactive Defense reports many innocent events. Antispam accuracy is mediocre. No privacy protection or parental-control features. Conflicted with other programs on one test system.

http://www.pcmag.com/article2/0,1895,1960797,00.asp