I've been using Avast! for two years now and it's an excellent product, lite on resources, and as long as you set the program update to Automatic, you don't have to babysit it. An A-1 anti virus. MSE is on the scene for everyone who is XP and above, I'm trying it out on my Win 2K Pro/XP Pro laptops, and so far I'm impressed with it. Looks a lot like Windows Defender (a RAM hog), but it's through and reliable so far. Right now, I'll give it a B+. With all of the choices today, there is no need to pay a cent for quality protection. The anti virus industry has never received a cent from me, although with MSE you indirectly pay because your system must validate before the install will proceed. And I can agree with that and respect Microsoft's stance on that. I strongly stand against software piracy. And too, those who run pirated software puts themselves at strong risk for viruses, and what's even worse, spreading them among all of us. The majority of the time that my laptop got hold of a virus was on a forum where someone creates a post to click onto, and there it is. Avast screaming at me to abort connection over a trojan horse. These people know that they are running cracked systems and have the balls to get on a forum to ask for help. Alright, I'm going to stop now, because I'm running the risk of getting off topic, although I'm discussing viruses here. I have my opinion of the best anti virus, and you all have yours. As long as you are comfortable with what you have and are using it, and staying clear of bad sites, that's what matters the most. That's the bottom line.