In Word 2003 or earlier, click on Tools | Options | View tab | uncheck
the "All", "Hidden text", and "Field codes" boxes | Print tab | uncheck
the "Hidden text" and "Field codes" boxes | OK.
In Word 2007, click on Office Button | Word Options | Display | uncheck
the "Show all formatting marks", "Hidden text", and "Print hidden text"
boxes | Advanced | uncheck the "Show field codes instead of their
values" and "Print field codes instead of their values" boxes | OK.