When a "Pop-Up" window, whether it be an ad or something else, opens and it's larger then your viewing space   (meaning that you can NOT click on the "X" in the top right to close the window)   if you were to press and hold the "ALT" button and press the "F4" key once it will close the window? Try it sometime. You don't have to have a pop up to try it, just open up an internet explorer window and hold down the "ALT" key and press "F4" once. FYI: This will close any window that is open....so if you use "dial-up" still to log onto the internet ( ie - AoL, Compuserve, Net Zero, or Walmart ) and you were to press the "Alt+F4" it will close down your program and log you out.