Recover product key for a Windows 7 Pro Natl. Academic Only OA license

[KuestersPatrick]

I'm a high school teacher and have several PCs that lost the Windows 7 license due to hard drive failures. The windows sticker has the label "Windows 7 Pro Natl. Academic Only OA" and has a tracking ID and another number at the bottom, but no product key. Is there a way I can get the product key for these PCs, so I can have an active version of Windows installed? Or is there an install I can download that will activate based on the PC hardware?

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