If you want to use Apple Keyboard on PC (Windows7), the easiest way to do this is mapping your keyboard. You can do it by downloading SharpKeys - Download SharpKeys . I downloaded a ".msi" and ran the program then I was able to map apple keys on windows keyboard right away. Make sure when you are done mapping keys, click on "Write to Registry" and restart your machine to take affect.
If you want to revert back to your original Keyboard settings. Just open up SharpKeys (download again if necessary) and delete those keys you have mapped and click "Write to Registry" and restart your machine. This should revert your keyboard setting back to default Windows keyboard.