Last week I had to rebuild my machine due to a worm that made its was into our office. We use Vipre antivirus and I had trouble reinstalling it. There was an expired license issue that we needed to resolve. When the Vipre agent finally got installed on my machine we got a warning of threat found on my machine.
One quick Google search lead me to the following link.
I hadn’t installed many programs yet, but Firefox was one of them. I don’t remember where I downloaded Firefox from, but I usually go to the organizations site to download. These one may have come from SourceForge.