Best of Anti-virus software

We all are very much concerned about our personal computers as in the current scenario each and every second a new virus is spread over the web. There are spy ware, malware and ad ware adds to the virus threat. Though its not possible to stop the virus being spread over the web there are software designed to protect our PC. There are number of Anti-virus software available in the market which are dedicated to all configurations and different available operating systems but then which one performs the best. There are software like AVG, Zone alarm, Symantec, Kaspersky and many. Most of these anti-virus come in packages that includes a virtual backup drive and PC tuner. The software that has been rated as the best is BITDEFENDER 2009. It has proactive protection that blocks hackers, malware, ad ware, spy ware and what not. It comes in different packages and as the others provides updates to secure the computer from new and unknown viruses that are spread.