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Your USB flash drive should plug into one of the rectangular USB ports on your computer's housing. Flash drives only fit one way, so don't force the drive if it doesn't fit. The USB flash drive should be at least 8 gigabytes in space so that it can accommodate most operating system installation files. Click the Windows logo in the bottom-left corner of the screen. This will search your computer for the Command Prompt program. It's a black box at the top of the Start window. This will prompt a drop-down menu.  If your mouse doesn't have a right-click button, click the right side of the mouse, or use two fingers to click the mouse. If your computer uses a trackpad instead of a mouse, use two fingers to tap the trackpad or press the bottom-right side of the trackpad. It's in the drop-down menu. This will confirm your decision and open Command Prompt. Type in diskpart and then press ↵ Enter to do so. You may be prompted to confirm this decision before proceeding. Type list disk into Command Prompt, then press ↵ Enter. Look for your flash drive's name, letter, or size in gigabytes to identify it.  If you don't know which one is your flash drive, unplug your flash drive, run the "disk list" command, plug back in your flash drive, run the "disk list" command yet again, and figure out which disk was absent the first time that you ran the "disk list" command. The flash drive is usually the bottom disk in this menu. Type select disk number into Command Prompt—making sure to replace "number" with the flash drive's number as presented in the list—and then press ↵ Enter. Type in clean and then press ↵ Enter. To do so:  Type in create partition primary and press ↵ Enter  Type in select partition 1 and press ↵ Enter  Type in active and press ↵ Enter Type format fs=fat32 quick into Command Prompt, then press ↵ Enter. If you encounter an error in the USB creation, repeat this process using the format fs=ntfs quick command instead. Type in assign and press ↵ Enter. You should see a confirmation message appear in the Command Prompt window. Your USB drive is now bootable, meaning that you can place an operating system's ISO file or an image of your computer's hard drive on the USB drive in order to install it on another computer.

Summary:
Insert a USB flash drive into your computer. Open Start . Type in command prompt. Right-click Command Prompt . Click Run as administrator. Click Yes when prompted. Enter the "partition" command. Bring up a list of connected drives. Find your USB flash drive. Select your flash drive. Erase the flash drive's contents. Create a new partition on the flash drive. Format the flash drive. Assign a letter to the USB drive. Close the Command Prompt window(s).