You are posting in the wrong group. Please refer to
<news:microsoft.public.mac.office.word>
where you can learn that Word 2004 for Macintosh isn't made
for Arabic.

For Arabic fonts (included with Mac OS or other), see
http://www.smi.uib.no/ksv/
http://www.unics.uni-hannover.de/nhtcapri/arabic.html

Use InDesign, Mellel, Nisus Writer, OpenOffice:
http://www.unics.uni-hannover.de/nhtcapri/#programs