ESET NOD32 is one of the best antivirus product. ESET NOD32 Antivirus 4 is a very effective protection available today to defend against a vastly increasing number of Internet and email threats.
It include Antivirus and Antispyware. It is lightning fast and operates smoothly in the background. It just need 60 MB memory to keep your system secure.
You can read more details about the product on its official website: