How change language format of a german keyboard!?

i have this german laptop. and its keyboard is german style, i formatted it on english. and i want to take it back to german. how can i change to german,.How change language format of a german keyboard!?
easy... almost. If you have a vista enabled computer, go on to your taskbar, hover to desktop and click on the letters 'EN' and go to 'DE' or something

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