Which is the best antivirus software that can be downloaded for free from the net?see details?

i have mc afee version 4.5.1 how can i update this to the latest version for free? how can i be protected from spywares

Which is the best antivirus software that can be downloaded for free from the net?see details?norton

AVG AntiVirus

http://www.grisoft.com/

To protect yourself from spyware download a program called Spybot Search %26 Destroy here:

http://www.safer-networking.org/

Which is the best antivirus software that can be downloaded for free from the net?see details?spyware remover

Here is a list of all the major free anti-virus programs:

Avast:

http://www.avast.com/eng/avast_4_home.ht...

Anti-Vir:

http://www.free-av.com/

AOL AntiVirusShield:

http://www.activevirusshield.com/antivir...

AVG:

http://free.grisoft.com/doc/avg-anti-vir...

BitDefender 8: (on-demand only, no real-time protection)

http://www.bitdefender.com/PRODUCT-14-en...

Clamwin: (on-demand only, no real-time protection)

http://www.clamwin.com/

Personally, I use the AOL AntiVirusShield. Don't let the name AOL scare you. AntiVirusShield is made by Kaspersky which is one of top-rated anti-virus vendors in the world.

In recent tests, the most popular free anti-virus, AVG, was only able to detect about 82% of a very large sample of viruses. On the other hand, AntiVirusShield was able to detect better than 99% in the same test.