Where can i get free norton anti virus for download and which is best antivirus?

i have older version of avg but i do not know abc about antiviruses pls tell me about antivirus and if i download a book how should i know that it does not contains virus

Where can i get free norton anti virus for download and which is best antivirus?best antivirus software

I'm not aware of any free norton, however...

The best software you should get is Spysweeper with Anti-virus, this software is too good and gets better everyday. This is ELITE software. It blocks over 173,100 threats. No other software can compete with that or come close for that matter. It catches everything and has active shields. I've used them all and it is 2nd to none. Norton Systemworks is very good. That's the only good software from Norton. I wouldn't recommend Norton Internet security, its not that great. Norton is not a system hog either and it's the 2nd best.

Don't waste your time with AVG, spybot, ad aware, CA, spyhunter, superantispyware, windows defender or anything of the sort. Stay away from anything that is FREE when it comes to spyware and antivirus. There is a reason why they free. They are NOT good.

Where can i get free norton anti virus for download and which is best antivirus?firewall

Norton antivirus is not free. If u need it so much just go to the store and buy it. It wont kill you.
I use Avira AntiVirus software.