How to delete a full underline that appears between paragraphs

[bobby36]

I type in a partial underline to separate sections. Then when I press
'enter' a bold full underline is automatically inserted. How so I delete
that underline? How do I prevent it? I use Word 2007

 

[Suzanne S. Barnhill]

Cause, cure, and prevention for versions up through Word 2003 at
http://word.mvps.org/FAQs/Formatting/CantGetRidOfLine.htm. The AutoFormat As
You Type setting in Word 2007 is at Office Button | Word Options | Proofing
| AutoCorrect Options.