Threats of harmful computer viruses are something we have to deal with on a daily basis. These viruses can sometimes do irreparable damage to your PC. As a result, effective software designed to combat attack on your system is crucial. AVG Anti-Virus Definitions is an update for the AVG Anti-Virus program. It is easy to install and even easier to use. It detects spyware, malware, Trojans and other viruses that can infect your computer through email, CD/DVD drives, USB and other portable devices. New viral threats are discovered every day, so it is quite comforting to know that this application includes automatic updates to make sure that you have the latest and most conclusive protection available. AVG Anti-Virus Definitions functions on Microsoft Windows 98, ME, 2000, XP and Vista operating systems and is available for free download.