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Today's security suites have a difficult job. Every other day seems to bring a new threat that targets Windows PCs. Spam is going through the roof, and phishing Web sites are proliferating as well. To find out which security suites can best handle the onslaught, we put eight of them through some tough tests under the 32-bit version of Windows Vista.

German security company AV-Test.org tested the antivirus, antispyware, and firewall components of each suite to determine how well the software catches both known malware and new malware (detected either through heuristics--recognition of the new malware's similarity to already-known bad code--or on the basis of its behavior alone). Due to the sophistication of the latest malware, none of the suites did well in the behavioral tests, but several of them did provide excellent protection against a smorgasbord of other baddies. Plus, most suites protect up to three PCs for the purchase price.

BitDefender Internet Security 2008 did the best job at stopping malware, but its interface needs work. Symantec's Norton Internet Security 2008 performed well, too, offering an array of useful features in a polished, easy-to-use package; that combination earned it our Best Buy award. These two suites plus Kaspersky Internet Security 7.0, McAfee Internet Security Suite, and Trend Micro Internet Security 2008 were our top five performers, each of which we review here. All five packages include antiphishing, data-privacy, parental control, and IM traffic protection.

Check outour ranked chart of all eight security suites tested for this article.

Security Suites Tested for This Review

For this roundup, we partnered with AV-Test.org to conduct extensive performance testing on the following security suites:

• Symantec Norton Internet Security 2008
• Kaspersky Internet Security 7.0
• McAfee Internet Security Suite
• BitDefender Internet Security 2008
• Trend Micro Internet Security 2008
• CA Internet Security Suite Plus 2008
• Avira Premium Security Suite
• Checkpoint ZoneAlarm Internet SecuritySuite 7.1