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Connect your USB recovery drive to the PC. Turn on the computer. Click Troubleshoot. Click Recover from a drive. Follow the on-screen instructions to complete the installation.
If you created a recovery drive when the PC was working properly, you can use it to reinstall Windows. Use this method if you were unable to reinstall Windows 10 from the desktop or if your computer will not boot into Windows. If you don't have a recovery drive, you can use a Windows 10 installation disc or drive. If you're using a laptop, make sure you plug it into a power source before starting the installation. If the computer was already on, reboot it now that the USB drive is attached. The PC will then boot from the recovery drive to the "Choose an option" screen. If you don't see the "Choose an option" screen, you may need to edit the PC's BIOS settings so that the PC knows to boot from the USB drive. See Set Your Computer to Boot from USB Flash Drive#Boot from the Flash Drive to learn how. A list of options will appear. This will wipe all data off the PC and install a fresh version of Windows 10. Once Windows is reinstalled, you'll be prompted to set the computer up as if it were new.