This tutorial works with window 8 and windows 8.1.
1- From the control panel choose Add a Language
2- Choose Add a Language.
3-Choose Arabic This Press Open.
4- Choose your preferred Arabic Dialect – We choose Arabic Egypt – Then press Add
5-In Your Task bar you will see Eng-ع Button you can switch between any language you like.
7-From the Administrative tab choose change system locale…
8-Choose Arabic Egypt then restart your computer and you will have Arabic support .