If you want to read Arabic on windows XP Click:
START=>
CONTROL PANEL==>
(you may need to click on: Switch to Classic View of Control Panel)
REGIONAL AND LANGUAGE OPTIONS=>
REGIONAL OPTIONS=> in Standards and Formats, change format to: Arabic.
ADVANCED ==>
Change language to Arabic ==> Last click OK.
You will reboot, and be able to read/write Arabic.
That's it!