Great question — answering as the UphillTech team:
I did that before with windows 7 and tried this - reinstalling windows 7 and when given the choice to 'upgrade' or 'install fresh' i told it to do it as an upgrade. It found the right partition and solved the problem.
Full answer by Jeff Clayton: https://superuser.stackexchange.com/a/784613 (CC BY-SA 3.0).
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