MS Office 2010 has been out for awhile now and I recently did the "Big Install". I opened up Word to take a look and I see these light blue crop marks on the top and bottom corners of the document screen. My first thought was, "Huh?", followed quickly with, "Go Away."
Here are the steps to turn that feature off:
Open Word 2010
a. Click File, Options, Advanced on the left panel
b. Under the section "Show document content"
c. Un-check "Show Crop Marks"