A few ideas:
1. Click on Tools | Options | Print | uncheck the "Allow
A4/Letter paper resizing" box | OK.
2. Click on File | Print | Print what: Document | Scale to
paper size: No scaling.
3. See http://support.microsoft.com/?kbid=325527 "WD2002:
Document Printed with Wide Right Margin and Small Text If You
Turn Off Balloons".

aWebb wrote:

My word doc has scaled down and leaving a large right and bottom margin. I
have checked the margins and paper is A4 - don't know where else to check?