Check your computer for malicious programs. It appears that's how this malware is distributed. It's attached to other legitimate looking programs. This is often the case with free PC cleanup utilities. Apparently, it can also be found in Firefox as a browser add-on. If you go to <code>about:addons</code> in Firefox, it might be installed there. Often times it's a "Babylon" related extension. If you can't find it, remove any add-ons that you did not install or that you no longer use. Hope this helps.