This document describes how to change the keyboard input language in Windows 7 and Vista.
Press Start > Control Panel.
Under Clock, Language, and Region, select Change display language.
Click the Change keyboards... button.
The input language has been successfully added. Press OK.
Note: Switching languages only applies to the application you are currently using. You must change the language for each application you want to use it in.
You will now see EN located in the taskbar:
To switch between languages, click the EN button and select the language you wish to switch to.
You have now changed the input language. You can quickly switch between languages by pressing Alt+Shift.