You need CD-RW or DVD-RW drive. Insert blank CD or DVD and double-click .ISO file. Then follow Windows .ISO image writer instructions. After creating the bootable CD/DVD, insert it to your target computer, enter the Boot menu and choose CD/DVD boot option.
If the target computer does not have a CD/DVD drive, it is possible to use external CD/DVD drive connected through USB. In that case, choose USB as boot option.