The top 5 antivirus brands of 2011 excel at keeping your computer working like new against the onslaught of spyware, adware, and virsues the internet has to throw at it. Though no antivirus is one hundred percent foolproof, these five fight off malware most effectively while avoiding the disruptions that other antivirus programs can sometimes cause.

1. Avira Antivirus

This all-around antivirus suite runs quietly and efficiently in the background, notifying users only when it needs an update. Its “Luke Filewalker” virus scanner keeps the malware at bay. As user Sue Lang says, “Avira acts like a good antivirus should, providing great protection without taking up too much memory”.

2. Malwarebytes Scanner

When a virus has found its way on your computer and you need to get rid of it, Malwarebytes is the way to go. It offers “quick scan” and “full scan” options on its free software, combing your entire system for viruses and adware that may otherwise go unnoticed with other antivirus scanners.

3. Microsoft Security Essentials

This basic but effective program is available for free to all users running Microsoft Windows software. As evinced by its name, the program gives users all the “essentials” they need to keep their computer safe from attack.

4. AVG Anti-Virus

Though it tends to run a bit resource-heavy, AVG is one of the best free antivirus suites out there. It has a powerful malware and virus blocker, stopping would-be attacks before they can be installed on your computer. As a bonus, AVG also comes with an advanced link scanner, which keeps web users from clicking on potentially dangerous links.

5. Norton Antivirus

For those willing to go a more expensive route, established company Norton offers a full security suite rich with features. It comes complete with a powerful firewall, a spam filter for e-mail, and even parental control settings for family computers.