I got a windows 8 laptop from a friend (http://www.toshiba.ca/productdetailpage.aspx?id=2147496267) and I have an old tornapart (Nothing left in the laptop) windows 7 HP laptop (Not sure what specific laptop). On the back on the HP laptop, was the windows 7 home prem OA sticker, with the product key. Is there a way I can downgrade my windows 8 laptop and use the old HP's product key? (I have no CD's for windows 7, but can I just download an ISO? This is the one Im currently downloading. Thanks everyone, hope you can help!