I think the first step is to describe (or provide a screen shot if you can) exactly what kind of pop up you're getting.
That way some of the more knowledgeable members of the forum can more easily ascertain what type and variant you've got on your system.
I'd certainly hold off formatting your entire drive for now — while that almost certainly would clear everything out, you'd lose all your other documents too (I'm sure you knew that!

)
Hopefully the solution isn't too far away.