I have had this problem for some time and unexpectedly solved it while trying to solve a problem with Excel 2010 on an HP machine. In excel I had trouble selecting the first tab in a spreadsheet. It behaved like I clicked with the right mouse button even when I did a left mouse click. This site gives the solution to that problem (I can't access it right now): <a href="http://www.mrexcel.com/forum/excel-questions/538503-excel-2010-worksheet-tab-
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