Hi all until yesterday my dell had windows 10 on it, until i was tampering with ubuntu and it repartitioned by hard drive!. Ubuntu was awful and so complex I installed cloud ready (chromebook). I want to get windows 10 back, however im not sure how possible that is. I know i can download the iso but how do i make that bootable by usb, and as importantly i dont have my product key and im not sure if its written to the bios or not too. Any advice would be appreciated. Thanks.