what is the best antivirus for PC???

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Good morning friends....I am a computer field student and i seen that many people uses antivirus in their Pc by spending lots of money bt at the time of buying a antivirus they are so much confused because in the market there are lots of antivirus are avilable so they can not judge what is the best for them...and the shop keeper give him a low sequrity product....for that reason today i want to discuss with you ..... i can suggest Quick Heal antivisus iz best....what is you think ??? Who is the best antivirus???