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If you’re unable to boot your computer and don’t have a recovery drive, you can download installation media from Microsoft and create your own installation disc or flash drive.  You’ll need either a blank USB flash drive with at least 8 GB of storage OR a blank DVD (Dual Layer preferred) and DVD burner drive. If you’re using a laptop, make sure you plug it into a power source before starting the installation. It’s the blue button near the center of the page. A file manager window will appear. It may take several minutes for the download to complete. It’s called “MediaCreationTool1809.exe” (the number at the end may vary). It should be in the Downloads folder. You may have to click Yes or Allow to run the tool. After a few seconds, you’ll be asked what you want to do. Windows 10 will now download to the computer. This downloads additional updates for the installation media. You’ll be prompted to select the type of media you’re creating (USB flash drive or DVD), and then walked through the media creation process. Once the media is created, remove the drive or DVD from the working computer. Connect the USB flash drive or insert the DVD, depending on the type of media you created. If the computer was already on, reboot it now that the USB drive is attached (or DVD is inserted). The PC will boot from the inserted media and start the install process. The options may vary depending on your location. If you don’t see any option to select a language or modify other Windows settings, you may need to edit the BIOS so the PC  knows to boot from the media. See Set Your Computer to Boot from USB Flash Drive#Boot from the Flash Drive to learn how. You’ll be prompted to enter the Windows product key, which you’ll usually find on a sticker that's attached to your PC. If you upgraded to Windows 10 from an earlier version for free or purchased Windows from the Microsoft Store, click Skip. Windows will activate itself automatically once installed. The remaining steps will walk you through the installation process. You’ll be asked if you want to format the hard drive in addition to reinstalling—this is up to you, but it’s typically only necessary if you’re going to be giving the computer to someone else. Once Windows is reinstalled, you’ll be prompted to set the computer up as if it were new.
Go to the Microsoft software download site on a working computer. Click Download tool now. Click Save to download the tool. Double-click the downloaded tool. Review the agreement and click Accept. Select Create installation media and click Next. Click Accept when prompted. Follow the on-screen instructions to create installation media. Connect the installation media to the PC on which you want to reinstall Windows. Turn on the computer. Select your language and other preferences and click Next. Click Install now. Accept the terms and click Next. Follow the on-screen instructions to reinstall Windows.