Steps:
1. Click on "Start" button and select "Control Panel".
2. Click on "Clock, Language and Region" button.
3. Click on "Region and Language" button.
A PopUp Windows will Open..
4. Click on "Keyboards and Language" tap.
5. Now, Select Language that you want to Displayed in Windows at the section "Display Language".
(Install your Language, If it not available in Language bar..)
6. Click on "Apply" and "OK".
Its Done....Your Language has been Set