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Anything suspect gets uploaded to Avast's cloud servers for analysis and a possible addition to the malware-signature database.
Forget about getting a personal firewall with Free Antivirus; that's reserved for the Internet Security and Premier products.
Avast Free Antivirus starts with a traditional signature-based scanner that compares software against a database of known malware.
To stop unknown malware, Avast's Behavior Shield heuristic monitoring watches how each new piece of software acts.
Guide: How to create bootable AVG Rescue CD / USB Shardana Antivirus Rescue Disc Utility (Shardu) is a bootable antivirus rescue CD utility that integrates with multiple antivirus rescue disks, useful utilities, linux live CDs and also Windows PE under one bootable disc.
Guide: How to Use kaspersky Rescue Disk as Bootable DOS Antivirus Guide 2: How to build Kaspersky Rescue Disk – Bootable Antivirus Guide 3: How to create bootable Antivirus USB with Kaspersky USB Rescue Disk Great antivirus rescue disk equips with their latest Bit Defender antivirus scanning engines (ICSA Labs certified).In other words, Avast Free Antivirus puts the free in freemium, and it's for those looking for a little extra from their free AV software.