This is a really simple question to answer – you need to use antivirus software to protect your own computer, and to prevent your computer from being used to pass on infections to other machines without your knowledge. If you use the internet and you don’t take precautions, you’re going to get infected. And you’ll infect others, including those you care about most like your friends, family, and business contacts because their information is in your email address book and other files on your computer.
If you don’t care about infecting others, let’s look at the economic argument for a moment. You have a computer that must have cost at least $600, and perhaps as much as $4,000. On top of that you’ll have a monitor for which you paid between $250 and $1000, and you’re running software costing at least $500 dollars. If you have business or specialist packages installed then I’m guessing you may have invested $5000 in software alone. You will probably pay upwards of 25 dollars a month for your internet connection. And if you store personal data on your PC, it is probably worth more than money to you.
So you’ve got equipment worth something like $1400 if you’re computing on the cheap, right up to (and beyond) $10,000 if you flex your wallet a little. Think of this as being the same in price as an acceptable older used car right up to the pretty good used car you could buy for ten thousand dollars.
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