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For PCs, Windows 7

Go to Start, click on Control Panel and select 'region and language'.
Click on keyboards and languages tab at top to modify keyboard(s).
Click on add on right.
Click on + by desired language, then + for keyboard.
Check the box for specific keyboard, ok at the top right of that area, then click to apply.
Click on EN (at the bottom toolbar on the right) to see other languages to select more.
Click on the keyboard icon to the right of language choice and choose specific keyboard.

MAC, OS X

At Apple icon, choose system preferences.
Under Personal, choose International or Language & Text (depending on version).
Click on Input Source tab (top right), check all keyboards you want activated, close box.
Click on the flag at the top right to choose language.
If you want additional languages, click on the flag, open Language & Text Preferences and check the other languages to activate.
Can check Keyboard & Character Viewer in the input source area (top left) to gain access to on-screen keyboard.