avast! Free Antivirus
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Full user review
"Great Antivirus - Perfect for Netbooks"
Once you get a Netbook you realize it's not the replacement laptop you expected. The processors are slow, disks are slow, and they are limited. Anti-virus programs must really make as few system demands as possible. Avast works great for this.
Program is not "Free" - you have to wade through and pick one paid service (wanna buy a magazine?) to get to the download page.
Works great and stays out of your face. Highly recommended.