The World's oldest and most trusted antivirus is AVG. THe latest version of AVG is "AVG Internet Security 8.5.322 Build 1495" released on 20th April 2009. FEATURES: All-in-one protection * Anti-Virus: protection against viruses, worms and trojans * Anti-Spyware: protection against spyware, adware and identity-theft * Anti-Rootkit: protection against hidden threats (rootkits) * Anti-Spam: filters out unwanted and fraudulent e-mails (anti-phishing) * Web Shield & LinkScanner: protection against malicious websites * Firewall: protection against hackers * System Tools: for easy system management Easy-to-use, automated protection Real-time protection, automatic updates, low-impact background scanning for online threats, and instant quarantining or removal of infected files ensures maximum protection. Every interaction between your computer and the Internet is monitored, so nothing can get onto your system without your knowledge. AVG scans in real time: * All files including documents, pictures and applications * E-mails (all major email programs like MS Outlook and Thunderbird supported) * Instant messaging and P2P communications * File downloads and online transactions such as shopping and banking * Search results and any other links you click on AVG checks in real time: * All files including documents, photos, music, and applications * E-mails (all major email programs like Microsoft Outlook and Thunderbird supported) * Instant messaging and P2P communications * File downloads and online transactions such as shopping and banking * Search results and any other web links you click on