I have a product key for windows 7 and I have windows 8.1. How do I install windows 7?
How to Install windows 7 over Windows 8.1?
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You have to get a W7 DVD somewhere or ISO. Microsoft used to let you download it but I dunno why they stopped. Maybe able to get it from eBay. If this is a brand name ready-built, the vendor maybe able to snail-mail you one after your proof of ownership.
boot from your windows7 dvd and format the drive.then let win7 install do its thing.