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i'm not sure if a repair will prompt you for ro the key again or not, if it was home you could "upgrade" to profesional without changing anything. if its pro to pro, you should be able to just enter a new serial key (google for steps if you dont know how).
i would recommend a fresh reformatted install with every operating system installation, you should back up your information anyway when you do that, so you might as well back it up and do it right...
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