I have a random white box that has appeared on ALL my excel workbooks. It's the same shape/size/spot in each sheet/workbook. It scrolls when I scroll and there doesn't seem to be any way to get rid of it. If I open another application, the box shows up on top of it (such as an internet browser/etc.), but if I minimize the excel sheets it minimizes as well. Please help me get rid of it!! Below is a screenshot (I've scrolled down because of personal information):

Box.png