The fact that the document was initially created in a different word processor is probably the reason for the undesired formatting.
Select all text and then click Format | Paragraph. Under "Indentation," make sure that "Left" and "Right" are both set to zero and that "Special" is set to "(none)."
On the other hand, if the document contains paragraph numbering, you need to recreate the numbering as discussed at
http://shaunakelly.com/word/numberin...ering2003.html.