After gaining help on another forum, these forums were recommended. I made the switch to Ubuntu a few weeks ago (completely wiping my disk of Windows and instead installing Ubuntu over it), and while I don't have major issues with it, I was wondering how I'd be able to switch back. My computer initially came with Win7 Home Premium pre-installed, so I have no disk, but I have a product key. I attempted to download Win7 from the Microsoft website, but wasn't able as the software was pre-installed by my device manufacturer (HP). I was wondering if it'd be possible for me to perform a clean install of Windows 10 (as I upgraded Win7 to 10), by downloading the ISO from the Microsoft website and going from there, as I was told it scans the hardware to see if my computer is still stored on MS servers. Any explanations or suggestions would be appreciated Many thanks!