Another concern while on the Internet is the dreaded virus.  Virii (plural of virus) are small programs that attach themselves to other programs on your computer, or small programs designed to damage your computer.  

When downloading programs, or accepting programs from someone, make sure that you run a Virus Scanner, such as Norton's Anti-Virus, or F-Prot on your computer before you run the downloaded program.  This will protect your computer from being infected.