I use BitDefender Internet Security 2013, but would recommend any of the big 3:
Kaspersky
BitDefender
Norton 360
They are basically on par with each other. It becomes a matter of personal preference/comfort level. I do not recommend McAfee.
What I do recommend is buying from an online retailer like Amazon and buying a multi-year subscription. I have 3 PCs and on Amazon I bought a 3 PC/2yr copy of BitDefender Internet Security 2013. I've seen Norton 360 with a 5 PC license (not sure if t's for 1 year or 2 years).
Here's the trick: Don't pay the renewal fee when it's time to renew. Instead buy a new multi-year subscription from an online retailer. BitDefender only offers 3PCs/1yr, but Amazon
also offers it as 3PCs/2yrs (for a few $$ more). The $$ savings are in the multi-year subscription.
With BitDefender (I assume this applies to the other brands as well) my subscription lets me download and install the most current version of the software as soon as the new version is available. So when it's time to renew I just buy a new 3PC/2yr copy from Amazon. Since my installed version of the software is the same as what is in the box, I only need the registration key on the CD to renew the software for 2 more years.
2005 Cruise America 28R (Four Winds 28R) on a 2004 Ford E450 SD 6.8L V10 4R100
2009 smart fortwo Passion with Roadmaster "Falcon 2" towbar & tail light kit -
pictures