It does a very good job at detecting and removing malware, and it has a smooth interface.

Installing Norton AntiVirus 2011 is a breeze: The well-designed installer requires you to click through only two screens before it begins installing. Norton's products also check to see if you have any incompatible security utilities installed beforehand, so you don't end up with a problem later.

BitDefender Antivirus Pro 2011

In our tests, it did a good job at detecting malware, and was the top performer at removing infections from a PC, which pushed it up the leaderboard, but it had some trouble blocking live malware attacks, preventing it from climbing any higher.

G-Data AntiVirus 2011

G-Data continues its recent trend of strong malware detection, blocking, and removal in 2011, and couples it with a good interface.

G-Data AntiVirus is generally easy to use. Its installation process took a few more steps than I would have liked, but it was reasonably straightforward.

Kaspersky Lab Anti-Virus 2011

 It did a great job at stopping brand new malware attacks, and a reasonable--though not top-notch--job at detecting known malware, and it sports a well-designed interface. On the downside, its impact on PC performance was worse than average.

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Trend Micro Titanium Antivirus Plus 2011

It's simple--some may say too simple--and easy to use, and it did a reasonably good job at blocking malware. Installing Titanium Antivirus is a pretty straightforward affair: It requires you to click through only a couple screens before installation begins. But you'll need an Internet connection when you install Titanium Antivirus--the installer has to download the software before it starts installing, which adds time to the process.

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