For quite a long time I couldn't update my NOD 32 at all. Today I found a web page just by chance that was full of free user names and passwords for a full version of NOD 32 2.7. And well, what it had worked. Just click "update to full version" in your NOD32 2.7 or NOD32 3.0 and then when prompted, enter one of those user names and passwords given to you in http://www.nod321.com/, then you will see how life change for you.
Enjoy your full version NOD32 now, and never lose a virus in the wild!