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What is this on Microsoft Word and how do I sort it?

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I am on Microsoft word and go to click off it and a box comes up saying "You cannot close Microsoft Word because a Dialog is active. Switch to Microsoft Word first then close the dialog" What does this mean? also it wont let me click on any of the tabs like "file, edit, insert, tools" either or any of the buttons exept for the minimize, maximize and the close button, and thats when the box shows up with the message. Also it wont allow me to type anything either in MS word. What is this and how do i sort it?