Don't-Miss Stories

Microsoft Security Essentials 2.1

We liked Microsoft Security Essentials' interface, but other products did a better job at blocking malware.

PC Tools AntiVirus Free 2012

In our tests, PC Tools AntiVirus Free did a decent job removing malware, but its real-world malware detection left something to be desired.

Comodo Internet Security Premium

Although Comodo Internet Security's firewall makes this freeware look tempting, its antivirus protection lagged compared to others we tested.

Malwarebytes Anti-Malware Free

Malwarebytes Anti-Malware Free's defense against zero-day exploits makes it a useful addition to your antimalware toolkit.

Avira Free Antivirus

Speed and a low rate of false positives are Avira Free Antivirus's best points.

Panda Cloud Antivirus

Panda Cloud Antivirus did well at detecting malware infections, but had trouble cleaning them up.

Avast Free Antivirus

In our tests, Avast Free Antivirus did well at battling known malware and less impressively at recognizing new threats.

PC Tools ThreatFire Free

Best as a supplement to your existing antivirus software, ThreatFire Free excels at detecting and blocking new threats.

AVG Anti-Virus Free Edition

Good test results in malware detection--and best-in-class at removal--bring AVG Anti-Virus Free Edition to the top.

Down but Not Out: Conficker Camouflages New Windows Infections

Windows PCs infected with Conficker are more likely to be compromised by other malware because the worm masks those secondary infections and makes those machines easier to exploit.