You need to go Control Panel -> Regional Settings then in the "languages" tab right check on the box that says "Install files for complex script and right-to-left languages..." and then click apply. It might ask you to insert the widows XP CD
After you do that, go to Control Panel -> Regional Settings again then click on the "Advanced" tab and select the Arabic language.
Originally posted by TheMajor
Somewhere in Control Panel -> Regional Settings there is a setting to enable Asian and other characters/fonts.
Arabic is not an Asian language