When it comes down to it,
Nathan has the right of it. Regardless of what some people may say, NORTON is not the first best choice. We're entering the same situation in computing as is extant in medicine where some will say "Use this!" solely because they have a vested interest to say so.
AVG anti-virus is free (for now, tho' not for long) and is amongst the most effective. What one member mentioned about AVG having problems, I would guess that to be down to an invasive worm targeted to kill it. Yes, that sort of thing happens (which is part of why NORTON (sorry to shout twice but it needs highlighting) is next to useless.
As some know, I work in a very high security IT environment (I am personally responsible for the control software of the substation that supplies Buckingham Palace, the House of Commons and the House of Lords) and I can say with clarity that the only way to be properly secure is to be 'invisible' and not to allow anything into your system when you don't know what it is.
My company will not give any Norton product houseroom and it is only through market pressure that we will even give Microsoft OS's houseroom (because they are so vulnerable). Thankfully we run on an isolated network so even Microsoft's weakness doesn't harm us as you need certain codes and certain frequencies to be able to bridge into the network {tho' in best 'conspiracy theory' tradition I can breach it with a mobile 'phone (of a specific network) and a laptop :lol:}.
Where I am heading with this I suppose is that I would fully recommend that you have a PC dedicated solely to internet access. Don't have anything on it that you can't bear to lose ('cos you may need to 'burn' it) and don't let it network to any other machine you have (the ultimate firewall is non-connectivity).
For the moment, I am vulnerable because I've recently gone 'broadband' and so my Net PC is also my 'best' (as in "gaming") PC but that will soon change as soon as I have the spare few hundred pounds to put a new disposable on the end of the line

.