If you're currently using Word 2010 or other versions, export all customizations - right click on the ribbon, Customize the quick access toolbar, Import/Export, Export. After installing 2013, import all customizations. Then your current ribbon/QAT settings should be automatically installed. You should also be able to replace 2013's Normal.dot with your Normal template from 2003/7/10 and it will bring all your macros across (at least it worked between 3 and 10! [Unfortunately I don't yet have 2013 so Mark please advise if these are off the "mark".]

Also worthwhile are changing file locations so that templates are backed up automatically, and document location is in the data partition.