I use Norton 360 too
It's great! I keep reading people saying it's crap, but I've been using it for like 4 years and I've never had a problem with it.
I've only had one virus since I got it, and Norton caught it in time and it did no damage.
And it's interesting cos when you buy it for the first time, you can put it on up to 4 computers! I'm on my Dad's one. But once the year subscription is up, you have to renew it and pay, but it's not that expensive.
This inspired me to check my subscription, but I still have 215 days left on it