I use avast home edition as well- I prefer it to AVG as you can tweak it more.
No AV is perfect though so also look a malware bytes- you can use it for free or pay. Just run it once every bluemoon.
Also prevex 3.0 in the free mode-it will find viruses but not delete them, the big plus is that they are not scared of reporting scummy programs as malware, whereas the big boys are scared of court action. For example prevex dealt with Micro Billing Systems months before the bigger players.