i just use Windows Defender that comes with Windows 8/8.1 but i'm a safe surfer and might not be for everyone
to be honest i'm not sure which AV is good right now because the way things change but i used to like Avast free and put it on
the pc's i worked on but now i'm not so sure about it because of things they have added in the newer versions have gave me
and others (if you read there forum) trouble
Avria free is also good but i do not like the Avira/ Ask toolbar
a lot off people on this forum seem to like 360 Internet Security/Total Security free
i'm really not sure about payed for Anti-Virus Programs as i would use the free AV's because i'm a poor person and lucky to
be on the internet anyhow
this is what i use
Firefox with Adblock plus,Bitdefender Trafficlight
Windows Defender
Malwarebytes pro but just use it as a on-demand scanner
Hitman pro as a on-demand scanner
Mcshield
GlassWire to see whats going on with Windows Firewall
and now Zemana AntiMalware Beta as a on-demand scanner
and Common Sense
on-demand scanners do not protect you because thay have no real-time protection so they are used as a second opinion scanner
i would think a good place to ask this about a good AV would be the War Room lol
http://malwaretips.com/forums/war-room.16/
you would get a lot of opinion because there is no Best Av just one's that work the best for you and you using your brain to keep your self safe
it took me awhile to find this out as i would infect my computer all the time and then found forums like this great one and learned to keep safe
there is a lot of very good info and people to ask here on MalwareTips so feel free to ask away and learn like i have
James