Reboot
If all else fails....reboot!
Alternate
Never click anywhere in a pop-up window. Even buttons labeled "Cancel" or "Close" or a red-X button in the upper-right corner are dangerous to click; doing so could trigger an infection--the opposite of what you'd expect.
To safely close a pop-up window, locate the button in your Taskbar that corresponds to the pop-up. Normally, the button and the pop-up will have the same title. Right click on the button and select Close.
If that doesn't work, you need to use the Windows Task Manager to close the pop-up. Press simultaneously the CTRL, ALT, and DEL keys, and, from the resulting window, click the Task Manager button. In the Task Manager, click the Applications tab, then select the pop-up window from the list and click the End Task button. If you're unsure of which task corresponds to the pop-up, close all the browser tasks in the list.
Electricity
If you need a "powerful" idea, see some alternative ideas for how to safely close this type of pop-up
Cables
Not a cable issue...check alternatives.
Mrs. Popalotus just launched her web browser and up pops an ad. Something about the ad seems odd and she just heard about some recent scams. Her class is ready to view the website she had planned, but she has a decision to make...
------------
Click on the letter below that you think is correct.
(C-cables, L-lights, E-electric, A-alternate, R-reboot)
Or
Scroll through all options.
Popsicles
Lights
Don't you wish a warning light would flash to let you know if the pop-up is harmful or not! See some alternatives for closing safely.