I've use Norton Antivirus 2002 and 2003, McAfee Security Suite from Dell, Bitdefender 9 and Eset NOD 32. All I can say is: NOD 32 is still the best, in my opinion. Norton and McAfee are easy to use, no doubt about that; Bitdefender is much more advanced but a real resource hog, while NOD 32 satisfy my security needs: light-weight, fast, efficient and uses very little system resource. Again, this is just my personal opinion..