AOL Active Virus Shield (AVS) is a free antivirus utility made available by AOL. Its engine is based on the one used by Kaspersky Antivirus 6. Active Virus Shield offers real-time protection.
Active Virus Shield is light compared to other commercial anti-virus products. It also does not consume much memory during startup. However, it does lack some features of Kaspersky 6.0 (such as proactive protection and HTTP protection), and the license provided is only valid for one year. Additionally, Active Virus Shield does not currently work with Windows Vista.
http://www.activevirusshield.com/
