The key is having fonts installed and also the language tools.
What operating system are you on?
I'm assuming Windows XP.
Make sure you are up to at least Service Pack 2. Then you can go into the Control Panel and go into the languages. This allows you to add keyboard support and non-western support. This means that it'll allow for Arabic keyboard import, fonts, and going from right to left.
Control Panel....Languages is the most important thing to take away.