Is your Microsoft Word 2003 or 2007 top margin is missing? I know it is bit strange but sometimes it happens in the print layout. There is a quick and easy solution for it.
In Microsoft Word 2003 open up Microsoft Word and move your cursor near to the top margin of the document cursor will be changed and says show white space. Click on it and Top Margin will be back.
If it did not work this is what Microsoft Help suggests for Microsoft Windows 2003 and Microsoft Windows 2007.