Uninstall Norton, and stop whatever behavior causes you to get viruses.
That's not a feasible strategy for most people to adopt, unfortunately. If it works for you, great, but exploits so abound these days that you really almost have to know how the operating system is coded be sure of staying virus-free.
I hate Norton with a passion. I've had so many horror stories with their products that I have to restrain myself from surreptitiously uninstalling it from friend's computers. Most of their software run tendrils deep into the operating system, making it impossible to remove them without starting fresh, and then they start to bog the system down. They eat system resources voraciously and exhibit behaviour which serves only to make it harder to use the computer. I've seen computers grind to a halt (Word wouldn't open documents, Outlook wouldn't send email, IE got continuous 403s) because of Norton.
In one case, Norton antivirus was past its trial period and told the operating system it was busy scanning files and wouldn't it please just stop the user from doing anything, while secretly it was off cavorting around the stack with svchost. I tried being nice first, telling Norton to please stop doing this, and didn't it realise how hard it was making life for me? It subtly refused, insisting that it wasn't doing anything wrong. I then tried forcibly restraining it, but it was shockingly liquid in this regard. I punched, and it merely flowed around my fist. I kicked, and it danced out of the way as if to say, "You think you can stop me like that?". Eventually I decided it had to die. This, however, proved to be no easy task. It came in four parts, each of which acted to stop me from removing its brethren from active service. I certainly couldn't kill them outright; they had befriended the operating system far too well for that. They were all well experienced at camoflauging their very existence. I tried carpet bombing their storage centres, hoping that this would prove fatal when they next started running. Unfortunately they had managed to insinuate themselves into the computer so well that they could pick up right where they had left off. Eventually, out of options, I succumbed to the ultimate - the nuclear bomb. They pleaded with me to stop, but I was insistent. They were able to muster no more than a simple sigh as the blast tore them to pieces. In the aftermath the charred remains of the Norton series of products lay on the battlefield, as if to taunt me with its inviolate presence. Thankfully in this regard the Norton series of products is one step above cockroaches.
