پښتو کیبورډ

In Pashto we use transliteration of the term "keyboard".

As I see, you have asked for installation of the proper Pashto keyboard, so please spare only 2 minutes and get the proper Pashto keyboard by following the instructions:
- click on the 'start' menu,
- click on the 'control panel',
- click on 'region and language',
- in the small window that opens, click on the 'keyboards and languages',
- click on the 'change keyboards',
- click on 'add'
- choose 'Pashto (Afghanistan),
- click on 'Pashto (Afghanistan) again,
- click 'OK'
- click 'OK' that exists there again.
Now open your Word document and change your keyboard from English into Pashto and from Pashto into English back by Alt + Shift.
And if you are not familiar how to type on Pashto keyboard, please click on the following link. There are two faces; one face shows the mostly used Pashto letters, but if you click on the shift there, you will see the remaining Pashto letters especially the five types of Pashto ی letter.
I hope you it would be useful, and if yes, you can say bravo to me and make my answer correct :)
http://www.branah.com/pashto

http://www.youtube.com/watch?v=VAAZaika7Kg
If you follow the youtube link above, that may be help you little bit.

http://www.lexilogos.com/keyboard/pashto.htm