acrobat reader won't convert full document?

hello all-- i have been trying to convert a pdf to a microsoft word document via acrobat reader, but it will not convert the full document. it is a checking form in which it gave me the option to type information into a single box, however the box does not expand the more information that i type into it, it only scrolls. this being so, when i convert the document, it only converts the document with the information in the box that can be seen sans scrolling. how can i convert this document and allow it to show ALL of the information typed into the box? usually the box would have an expand option and would spread out over several pages, but reader converts it as a single page document with only a portion of what i have typed. any advice?