Now that I have it, what do I do with it?

Is it fully automatic, since there's no scan button?

You can try

Trend Micro (http://shop.trendmicro.com/trialpay/?ut ... n=TrialPay) they have a decent online scanner and remover

There should be a little icon in the bar at the bottom of your screen. Click on that to raise the menu. Set your configuration (see instructions on the Comodo site). After that, you should get automatic updates, but you can request updates at any time. One of the good things about BO Clean is that it operates unobtrusively in the background without advertising itself like AVG. The little icon changes color every 7 seconds to let you know it's working, and even that can be turned off. BO Clean operates continually rather than doing periodic scans. The Comodo site explains its operation.