Avast Free 5, formerly known as the Home Edition, protects you with  multiple guards. The antivirus, antispyware, and heuristics engines form  a security core that also includes multiple real-time shields. The  adjustable mail and file system shields join the pre-existing behavior,  network, instant messaging, peer-to-peer, and Web shields. The  behavioral shield is a common-sense feature, as security software  publishers leverage their large user bases to detect threats early and  warn others. Other new features include a silent-gaming mode and an  "intelligent scanner" that only looks at changed files after  establishing a baseline. The biggest change in Avast 5, though, is the  interface. Gone is the music player default look, which was skinnable  but confusing. In its place is a sleek UI that new users should find far  more manageable. It's also Aero-friendly, with Explorer-style  navigation buttons in case you can't remember where you tweaked a  particular setting.
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