word wrap problem in my post

Hi, I need some help with this problem. I am using copy and paste from a Microsoft Word document to compose my post. When I paste the document to the WordPress Visual Editor box, the format was messed up. So I try another way, as many suggest, by copying the content to Wordpad first, and then from there make another copy and paste it onto the Visual Editor. Now the problem is that all the text in a paragraph stretches endlessly horizontally, apparently without a “word wrap.” How can I fix the problem? Here is the link to my problem I am talking about.