Line Across Top of Document

Hi,

I am creating an applications form made up of several tables and other formatting.  I have suddenly had a horizontal line appear across the top of the pages that extends completely across the page.  I can't click on it or highlight it to delete it.  I am pretty good with word and am stumped.  I pasted a screen shot below.  Although the line looks grey in the screenshot it is actually black and runs across the top of each page in the document.  How can I get rid of it???