Our kids are currently computerless. But, when they had one, we used OpenDNS. It's free and it gives you a lot of control as far as blocking certain categories of content and particular sites. Because our kids are so young, we pretty much blocked the entire internet and then white listed the sites that they were allowed to go to. It was mostly just simple things like PBS kids and some educational stuff. It also made it so that they couldn't go to any sites from ads that they might click on. That was all they needed at the time, but I'm sure the older they are, the more you have to open things up. I don't know that OpenDNS does much as far as viruses goes, though. I can't remember if we used it for that.
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