You need to check your ODBC/OLEDB connection and make sure that Unicode or UTF8 is used. Then QlikView will load the data including arabic characters without problem. To display it, you need to choose a font (in the list box or chart) that is able to show UTF8.
Do you load from ODBC or OLEDB? Then you need to check the properties of the connection. Or do you load from a text file? The check that the text file is UTF8 and that it says UTF8 in the Load statement in the script.
Arabic is no problem for QlikView if the connection is OK.