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This is available for free from Microsoft. Despite its name, this tool works with Windows 8 ISOs as well. You can run this tool on virtually any version of Windows. This is the ISO that you created or downloaded in the first section. Click browse to navigate to the file. Once you've selected it, click Next. The download tool will allow you to create either a DVD or USB install. Click the USB Device. Make sure that your flash drive is connected correctly. You will need at least 4GB space on your flash drive to copy over the Windows installation. Click Begin Copying. The program will format the USB drive to boot and then copy the ISO file onto the drive. The copying process can take up to 15 minutes to complete, depending on the speed of your machine.
Download the Windows 7 USB/DVD download tool. Select the Source File. Select USB Device. Choose your USB drive from the list of attached devices. Wait while program works.