Microsoft Windows 7 at present not support From Microsoft . You can consider with Windows 8.1 or Windows 10 Faster Slower and Safter ^^ Have much Video show you how can install it on your devices Good luck with that . Becareful if you dont do it your computer will get error and Unstable operation
Windows 7 at present still not support from Microsoft you can go on microsft to download newest windows is windows 10 to install try version to use for 30 days .
If you need to install or reinstall Windows 7, you can use this page to download a disc image (ISO file) to create your own installation media using either a USB flash drive or a DVD.