I don't use one, don't need it, no offense to anyone, but honestly, most viruses don't just show up on your computer, you get them from the dumb things you open and not paying attention. I haven't ever gotten a single virus on my computer and don't plan to since I know that if I get a e-mail from someone I DON'T EVEN KNOW, I won't even read the subject matter, that thing is gettin deleted. And I don't even get those kinds of e-mails or anything like that so I don't even worry about it, just be cautious people and you won't get these things.