Originally Posted by Charles Kenyon

Quibble: It is Office 2010, not 10.

Conversions never work well when you want to edit the end product. They can help, but the resulting document is almost always filled with anomalies.

When you create a new document, do you have the same problem?

How about if you start Word in safe mode?

Also, look at Showing non-printing formatting marks in Microsoft Word.