Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
Hi I'm a Mac and I can't get viruses!
Hi I'm a Mac and I can't get viruses!
J/K
I use Norton, but it isn't free, however I know people who have used Macs for 10 years and never has their computer fried, where my (windows) computer gets fried at least once a year even though I use Anti Virus
Microsoft Security Essentials - Free and got good test scores on AV-Comparatives.
Avast! is at the moment using 47mb of RAM. The web shield is using 80mb. So its not overly lean, but if you have more than a GB of RAM, you wont notice it running.