text: nod32 and avast! antivirus.which one to choose? any suggestion with valid reason? both these antivirus have low system usage and very user friendly... you are right!  i would say nod32 is good but is pretty pricey.  avast however is free but pcworld has rated the score 77 but i don't know about nod32's.  i know nod32's is better than avast as you can tell by all the awards.  so avast is good for free and nod32 good for detection.  nod32 is the best among all i used! i hope this infomation was helpful to you!