The answer is really simple. To protect your own computer from damage, and to prevent your computer from being used to pass on infections to other machines without your knowledge.
Many people are reluctant to shell out the cash for decent antivirus software. I’ll agree that at roughly $50 for a decent antivirus program, it isn’t exactly small change. But, let’s look at the costs more closely for a moment:
Computer –> $600-$4,000
Monitor –> $250-$1000
Software –> $500-$5000
Internet Connection –> $25+/month
Personal/Business Data –> Priceless
So, on the low end of the scale we are looking at a computer investment similar in price to an older used car, on the higher end, similar to a newer used car.
Maybe I’m wrong, but I’m guessing that you wouldn’t buy a used car that had all the locks removed and didn’t need a key to start it, and comes with a free “STEAL ME” sign on it too.
Having a computer that does not have up-to-date antivirus protection is absolutely the same. You are simply asking for trouble.
And trouble WILL find...