Why anti-virus software is so necessary for your mainpc ?

Now a days practically everyone are online.They spend their time in social network or online games or

downloading and exchanging files, and developers are in such a hurry to get their Web sites up or their files out that checking for a nasty bug is more of a courtesy than a requirement. If you're not careful, your computer can end up with a worst virus that makes your files act oddly, crashes your computer, pops up bizarre messages, or worst of all, destroys your operating system.

If your computer is not on a network, and you never, ever install new programs or download files from the Internet or open email enclosures, you don't have to worry about viruses. But that's like living in a sealed bubble. Most of us have to go out into public every day, where we're subject to the germs carried by others (though natural immunities will usually protect us from most of them.) Likewise, most people also have to update their software and are interested in communication and information from others. Luckily, there are some preventions and cures for these viruses by installing the anti-virus software and regularly scan for the virus.