Welcome to Photoshop Gurus forum. Register a free account today to become a member! It's completely free. Once signed in, you'll enjoy an ad-free experience and be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
In truth you need to use the Middle Eastern versions. English editions cannot handle the complexity of the Arabic language.
You can try this but I have no guarantee whether it works since I don't know arabic... lol..
http://www.softforall.com/Utilities/Desktop/Parnian_Plugin_for_Photoshop09030094.htm
I don't know if this wil be useful, but try this Template to edit and create Arabic text
http://www.adobe.com/support/downloads/detail.jsp?ftpID=4107
Hope this helps.