I have both AVG and Norton installed on my one computer and McAfee, AVG and Norton on my other, but there's one thing I don't understand. What makes them so different? i know they all have different options and some work better than others(Norton sucks), but why is that? AVG works the best for me. Another thing i was wondering was about the different types of viruses. Is it coding that makes them different? Why were they created? I did try to google it, but my school computers won't let me access the sites, and AOL decided to be the worst its ever been and not allow me to access with some 504 timeouts. thanks in advance for any help!