Kaspersky is rated as one of the top most antivirus in the market.

New and Improved features in Kaspersky Antivirus 2010:
*Color-coding of links to unsafe websites – (New)
*Kaspersky Toolbar for browser – (New)
*Special Game Mode – (New)
*Basic protection against identity theft – (Improved)
*Protection against viruses and Trojans – (Improved)*Blocking of suspicious programs – (Improved)
*Restoring the system by burning a Rescue CD in case of infection – (Improved)
*Secure Virtual Keyboard – (Improved)
*Proactive Protection – (Improved)

How To get Free Activation Key valid for 6 months:
*Downlaod Kaspersky Anti-Virus 2010 from Kaspersky Official Website
*Visit this Promotional Page and click on the topmost orange color button under no.1. It will take you to the page where you will be asked to enter your Windows live account details.
*Enter your windows live or hotmail Id and you will get a six-months Valid License Key in your email.

You should also check my previous post regarding Download Free Norton Internet Security 2010 Licence key valid for 90 days

[via]