Worms differ from viruses because worms do not infect other files as viruses do. Instead of infecting other files a worm makes copies of itself over and over again. Worms can reduce system resources such as hard disk space or reduce bandwidth by spreading over network shares. Today’s worms are also called internet worms or email worms. These worms send copies of themselves to recipients in infected users’ address books. These types of worms can cause loss of productivity and revenue, as email servers can not handle all of the traffic. A Trojan is program that seems to be valid but in fact it does something to harm your computer. (www.antivirus.miningco.com)

Early viruses were pieces of code attached to common program such a game or word processor. A user might download an infected game from a bulletin board and run it. A virus like this is a small piece of code in a larger program.

No computer should go without anti-virus protection. There are many different companies that offer a variety of anti-virus software. Three companies that have anti-virus programs that I have researched are: McAfee Virus-Scan, Kaspersky Anti-Virus Personal Pro, and Norton Anti-Virus.

As technology keeps improving virus creators are learning more and more. One thing they learned was to load the virus in the memory so the virus could keep running in the background as long as the computer remained on. Another thing they learned was the ability to infect the boot sector on floppy and hard disks. The boot sector is a small program that is the first part of the operating system that the computer loads. The boot sector contains a tiny program that tells the computer how to load the rest of the operating system. By putting the virus in the boot sector it is guaranteed to get executed. The virus can load itself into the memory immediately, and is able to run whenever the computer is on. Boot sector viruses can infect the boot sector of any floppy disk inserted in a machine. On college campuses where people share machines all of the time viruses can spread like wildfire. (www.memoryoptimizer.com)

The Kaspersky Anti-Virus Personal Pro was specially developed for advanced users seeking the most up-to-date anti virus technologies. Anti-Virus Personal Pro constantly controls macros executed on your computer, and prohibits any suspicious action. The integrity checker, Inspector, traces content modifications on your computer. If inspector detects a virus attack, it will enable the complete disinfecting and recovery of your disk. The program consistently controls all possible doors that can be used by viruses attempting to get into your computer including: email, the internet, disks, CD’s and more. The program doesn’t allow viruses to exist in any location on the computer. The unique background running virus-interceptor, Monitor, permanently resides in your computers memory, checking for viruses in files while they are started, created

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