Well most of you might already know that ESET is a lightweight (Compared to others) and efficient virus guard out there. Here's how you can get the latest NOD32 version 6 free for a whole year.
German magazine called heise is giving out keys and all you have to do is visit the below link
http://www.heise.de/ct/special/13/06/dvd_download/
Enter your email , fill the captcha code and click the blue button. That will send you a link to download the software and a activation code.
Then use this link - http://www.eset.com/us/register/ to register using the activation code. This step might not work if you are outside Germany so use a German VPN or Proxy (you can find plenty on proxy.org) on this step.
Enjoy!