antiviruses

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Since the time I've learned operating computer, I've been noticing that whenever a new PC virus is spread, there are companies to make anti-viruses. And then finding out the weakness of the anti-viruses, new types of viruses are spread. This is a kind of hide and seek game which is still going on and on. If we take closer look, we see that when any new virus is born, IT researchers launch anti-viruses for killing it. We get forced to purchase the full version of anti-viruses as the free versions are not so strong to fight the viruses. The free anti-viruses are effective only against the old viruses, but cannot encounter the new ones. The purchased anti-viruses can kill the old and contemporary viruses. If they cannot kill the new viruses, they can resist them entering the PC. So what we see? We see when any virus spreads, we buy anti-viruses. If no virus is launched none will have to buy new anti-virus. This is a very good business. Some critics say that it is secret pact among the virus-producers and the anti-virus producers. What do you say?