Been using AVG for awhile, I'm open to using new ones though if their reliable and don't beg me to buy them
I had Nod32/ZoneAlarm combo for a good 2 years but i still some how managed to get infected, now i use bitdefender w/o zonealarm and so far (5 months) i havent had any issues with pest.
I had avast home free edition which was okay but now I have ESET NOD32 which does a fine job in protecting my PC