I use AVG and lovelovelove it.
Also, Ecrofirt is my resident expert and he uses AVG. I trust his wisdom.
It's also never given me a problem. I recommend it to EVERYONE and it hasn't given my parents, friends, anyone I've had install it a problem.
Just remember to only use one antivirus on your machine--you probably already know that, but I knew a girl who was like "omg I have Norton AND Mccaffee AND Avast AND AVG AND I KEEP GETTING TROJANS WTF."