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Could your keyboard layout have been switched from International to US (or vice versa)? That’s the only thing that really comes to mind, although I don't know the differnces off the top of my head and I’m not sure why changing the settings in Office would cause that to change as well. Maybe a rogue hobbit did it. Or one too many Steinlagers. Anyway, here is a link to a step-by-step guide from Microsoft on how to change it. The page also has a “fix it for me” button if you don’t feel like doing it yourself. This guide is for Windows 7, I’m not sure it would be exactly the same for Windows 8.