Avast Internet Security 2017 - 1 Year 3 Users Intelligent antivirus - Detects all kinds of nasty threats, from viruses to malware. Yes, even spyware, ransomware, and phishing attacks. Firewall - You lock your front door to keep thieves out of your home  so why should your computer be any different? Firewall keeps you safe from all kinds of intruders. Sandbox - Ever downloaded a file from a shady server and suspected its trouble? Test files in a sealed space first, and keep the rest of your PC safe. Home Network Security - Is your router set up properly? Well tell you. Otherwise, anyone can break into your network and anything connected to it (like your computer, phone, or printer). Smart Scan - The ultimate time-saver. Check your PC and network for all kinds of issues in just one easy click.