Free Antivirus : Microsoft Security Essentials

Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.

Microsoft Security Essentials is a free* download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest technology. It’s easy to tell if your PC is secure — when you’re green, you’re good. It’s that simple.

Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want—without interruptions or long computer wait times.

Features

· Comprehensive malware protection
· Simple, free download
· Automatic updates
· Easy to use

Requirements:
· For XP - CPU with clock speed of 500 MHz or higher
· For XP - Memory: 256 MB RAM or higher
· For Vista / W7 - CPU with clock speed of 1.0 GHz or higher
· For Vista / W7 - Memory: 1 GB RAM or higher
· VGA (Display): 800 x 600 or higher
· Storage: 140 MB of available hard-disk space
· An Internet connection is required for installation and to download the latest virus and spyware definitions for Microsoft Microsoft Security Essentials
· Internet Browser (IE or Firefox).

Download: Microsoft-Security-Essentials-Download

“Since its from Microsoft i think it can easily identify small behavioral changes in window system files that are mainly caused due to Virus,Malwares,Spywares etc”

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