Every 5 minutes I hear people say install this its the best and then 10 minutes later its not the best, that one is...
Avira IMO isreally bad compared to Avast.
NOD32 I think is the best, however, I have not renewed my subscription for it and thats why I went and eventually found Avast to my liking.
Adaware solutions I am using NoAdware 4
Neither Avast or NoAdware have found anything on my PC for over a year now, except that if I download a keygen or some other naughty app, they are almost always containing something or other.
One of the best things you can do, is make sure you have a good firewall. I simply use Windows' own firewall coupled with the routers hardware one.
I dont get infections that way... Have not done for some years... nothing ever finds anything anyway?