Download and install updates (recommended).After it, a Get important updates window will appear along with the two options:.Here you will find the Setup.exe file, you have to double click on it, and then click Yes when the User Account Control dialog box appears.Now, click on the This PC (My Computer) to open it and right-click on the USB or DVD drive, click Open in new window option.At first, if you have bootable Windows 10 USB, then connect it or if you have a bootable DVD then insert it in the optical drive.You can go with this method only if your Windows 10 PC is in bootable condition, if you are unable to boot your system then you can’t execute this method to reinstall the Windows 10. #1: Reinstalling Using Bootable Windows 10 USB or DVD #5: Reinstall From USB or DVD Without Formatting the System Drive.#4: Refresh Windows 10 Without Losing Files.#1: Reinstalling Using Bootable Windows 10 USB or DVD.