You can set your computer to allow for searching in Arabic by clicking "my computer", "Change a Setting", "Date, Time, Language, and Regional Options", "Regional and Language Options." You will have to choose to "Install files for complex script and right to left languages."
There is also a virtual keyboard at "Start, Programs, accessories, accessability, on screen keyboard" which will have Arabic font after the previous step is done. There are also Arabic -English keyboards available on the internet which allow you to type in Arabic and then cut and paste.
Functional online keyboard
Search in Arabic or English
Allows searching in English, French or Arabic