Many people have reported being redirected on certain websites to a page that says they've been infected and are told to call a 1-800 number for service and cleanup.
Do not call that number! You'll be scammed out of $200+ if you end up falling for it and possibly convinced to be on a service plan or something worse.
In fact, your computer might not actually be infected at that point, but that website you last visited or the link you last clicked on might be compromised.
Better safe than sorry, though. If this happens to you, manually run a virus scan or bring it in to get us to check it out for you. It'll definitely be cheaper than letting these scammers on your computer or worse, letting them get your banking information.