Q:  In Microsoft Office 2007, how do I change my font to a default setting?  

A:  In Word, click on the little arrow in the bottom right-hand corner of the "Font" box up at the top of your screen.  A box pops up.  Select the default font that you would like.  You can also click on a different size, bold, italic, etc..  Then click on the "Default..." tab at the bottom left-hand corner of this box.  A message will come up asking you if you are sure.  Click "yes" and close out.  Unless you change it again, from now on everytime that you open Word, your default should be what you have chosen.