I just use AVG Anti-Virus Free Edition and never have any problems. They also have two paid versions with more features. I also hear that Avast is a good one too.
NOD32 without a doubt. my friend had norton installed on his computer. as soon as i got rid of it and installed NOD first scan of his hard drive and one worm and 2 trojans popped up.
NOD 32 ALL THE WAY.... GOT IT INSTALLED ON ALL MY COMPUTERS... NEVER HAD A VIRUS SINCE NOD 32... ... AND OF CORUSE I BORWSE THE NET MORE CUATIOUSLY...LOL sorry for caps..didn't mean to... and didn't want to retype in lower case..lol