Thorohhh

Hi, I have a document (see below) where the letterhead should go to the edge of the page at the bottom. When viewing the document it looks right. But, when I print, small white margin is placed around the whole page. I have tried to put the margins of the document to 0, but Paint auto-changes them to 0.12" and won't allow them to be any less. How can I remove these margins? Even when I convert the file to another document type, the margins are inserted as well.