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I do not experience pop ups on this site. Have you used any free computer cleanup products such as CCleanr or Malwarebytes. Assuming you are using Internet Explorer try clicking on the gear symbol on the upper right and resetting to defaults.
CorvetteForum does not use Pop-ups for advertisements. It is either a rogue ad or you have an infected computer. Note that even if it only occurs on this website, that does not mean your PC isn't infected. Installing an ad blocker probably doesn't address the root issue on your computer.