You can download the support software to an external drive.Install support software that lets Windows work with your Mac hardware.An external drive, such as a USB thumb-drive, formatted as MS-DOS (FAT).An installation disc with Windows 7 x32/64, depending on your Mac model.A built-in disc drive or a compatible external optical drive.If they aren't available, use a USB keyboard and mouse.
If you are installing Windows on a portable computer, connect the power adapter.