Windows 7 professional restore

I bought a computer that had Windows 7 Pro. It didn't come with a disc but does have the product key sticker.

My wife installed Windows 7 HOME over it *gah* I can't figure out how to undo that to get it back to professional. Seems to be a downgrade.

The drive does have a partition but I know nothing on how to get access to it or if that's where the Pro is "lurking" out how to unlock it via the key that came with the computer...
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