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These vital tools, selected by PC World’s editors, will protect your PC and will help you rid your computer of a variety of threats.

Ad-Aware 2008 Free
Remove spyware and protect your privacy with this popular free anti-spyware program.

Spybot Search & Destroy
This anti-spyware program is free, provides proactive protection, and is largely effective.

AVG Anti-Virus Free Edition
Free program [...]