Ok, so the problem (for some of us) can't be solved in Google Chrome's settings, it for sure is a virus that some already identified as Spigot. Is it possible that the virus changed name though? I can't find it anywhere (ran a scan).
So what actually happens when you open your browser? Where does it take you and if you use IE or any other browser in the box, does that go to the same site or to your usual homepage?