How to add language to Windows

 Step 1 : Click on the language bar on the right - down of the desktop.
    Step 2 : Click on language preferences.

    Step 3 : Click "Add a language". It will show you the "Add language" window.

    Step 4 : Select the language you want to add. For me is Japanese.

    Step 5 : It will add to your own Language bar. It complete in some language, but Japanese want to doing something to make it can use.

    Step 6 : Change the language to the installed language and right-click on the language bar. And select "Hiragana". Now it complete you can type your installed language.