User blog:TheMindofMe/I have a huge problem

So I was just on my computer making iTunes covers. I tried to click on a background image that I was going to use for George Washington vs Barack Obama when my browser suddenly started experiencing some virus-like symptoms to the point where I saw a pop-up that said

"Chrome Alert; please call [some number"

or something like that. Since it wouldn't close out, I just quit Safari, which of course removed the pop-up, but also my ability to use Safari entirely. I tried restarting the computer but Safari was keeping it from doing so. None of the answers I've looked up seemed to solve anything. So please, if you're a fellow Mac user and have experienced this, I would love to hear the advice you have. Thanks