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Using a computer without taking protective measures is like playing a game of Russian roulette. Most e-mail messages, Web sites, and programs aren't loaded with anything harmful. But sooner or later, every system will take a hit from malware--any malicious programs or code that can damage or disrupt the victim's PC.

The security software we review here--antivirus scanners and their anti-spyware cousins--provide essential defenses. Our tests show that the top antivirus scanners stop almost all the nasties they are designed to catch. But antivirus software does little, if anything, to stop spyware such as surveillance programs or ad-serving apps that monitor your surfing habits. So you need anti-spyware to fill the gap. This two-part review looks at both types of packages--and chooses the best.

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