(internet explorer) there's a pop-up

Question

(internet explorer) there's a pop-up that comes on and it say's that they are sorry for the inconvinience and any files open may be closed and it has a box with acheck mark that reads restart internet explorer and under that reads two boxes that you can click on either one they read send error report and another that says don't send and when i press ctrl alt delete lexplorer pops up and then it reads it has performed an illegal opperation and it lets me remain on line but if the pop-up appearsonce again and i press ctrl alt delete again it then boots me off what do you think is the problem.