A growing problem in using computers is computer viruses. Viruses are pesky little programs that some hacker with too much time on his hands wrote. Viruses have been known to create annoyances from displaying messages on the screen, such as "Your PC is now stoned," to completely obliterating everything that is contained on the computer's hard disk. Viruses are transferred from computer to computer in a number of ways. The most common way that users receive viruses at home are downloading programs off the internet, or off of local Bulletin Boa ....