I've used just about all of them out there and prefer the full version of MalwareBytes over Norton/Mcafee and the others. I've had good luck with NOD32 and Kaspersky if you are looking for something to buy from a store. Most of the retail boxes have mail in rebates if you shop around, so you can probably get one of them for free. If you are not a "high risk" user, the free software like AVG is probably all that you need. You might run the free version of MalwareBytes occasionally as well just to get a second opinion as mentioned above. Trend Micro also has a free scan online that I sometimes use called "House Call". I think I'm just partial to the name.
2 notes:
-Check with your internet provider too. Around here, Time Warner offers free internet security software from Computer Associates.
-Avoid the "Internet Security Suite" type bundles
if you are using a wireless router and just get a plain "antivirus" program. The internet security suites that all of these companies are pushing come with software firewalls, and you really don't need that if you are using a router. It's just going to slow your computer down.
Here is a deal this week for Kaspersky Antivirus that should make it $9.99 after rebate:
OfficeDepot: https://www.officedepot.com/a/products/709492/Kaspersky-Anti-Virus-2012-Traditional-Disc/
Rebate: https://forms.young-america.com/124525_441-94.pdf
if you need more than one copy, Trend Micro might be a good option. I used this when I worked for Geek Squad years ago and like the way it runs.
OfficeDepot: https://www.officedepot.com/a/products/710383/TITANIUM-ANTIVIRUS-3-USER/
$30 Rebate: https://forms.young-america.com/124690_NV71-737-9992-2011-11-01.pdf
$30 Rebate (if you have another antivirus barcode from your current antivirus: https://forms.young-america.com/124691_NV71-738-9992-2011-11-01.pdf
Sorry for the long post! Spending other people's money is a lot more fun
-House
I'll check around the house too, I might have a free copy of something laying around.