Last winter my PC became infected with a popup that just wouldn't go away. The various popup killers that I had installed on the computer failed to stop the annoyance or even locate it once it embedded itself onto my PC's hard drive. After a few weeks of dealing with this insidious bug, I went nuclear on the hard drive and reformatted it just to get rid of that popup machine. After this I went searching for a better way to browse the Web, and I found it in Firefox.