Most viruses are very preventable by an up-to-date virus scanner. A virus scanner must be up-to-date because it can only scan for the viruses that it knows how to find and remove. Therefore, an out-of-date virus scanner is just a slight step above having no virus scanner at all. New viruses are created all the time and if the virus scanner is not regularly updated then it is very likely that the new virus will slip right past your defenses.

In order to be secure you need an up-to-date virus scanner constantly running on your computer that scans all of the files coming into the computer from the internet and e-mail for any signs of virus. If one is found then it is blocked, quarantined (placed in a special place on the hard drive where it can not do anything), or deleted, and then the computer user is notified of the potential attack. Firewalls can also help prevent some viruses from getting on your computer. They can do this by blocking communication channels between your computer and others which are unnecessary for the computer to receive information from. More will be discussed regarding firewalls later.

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