Techmell.net - If you intend to upgrade to Windows 8.1 and unfortunately you are not having a DVD drive, don’t be vexed. You can install Windows 8.1 through a Flash Drive now. You just need to create a bootable Windows 8.1 Flash Drive that can be performed through various ways. You can do it by using a command prompt, but here is an easier and simpler technique that has been discussed below. You just need a few mouse clicks to complete the task.