If you are using Windows XP or later, you plug the drive in to a power-pont (if required) and into your computer's USB port. Windows should automatically detect it and automatically install the driver for it.
Windows will tell when the driver has been successfully installed (a message pops up near the clock at bottom-right of screen). It will say "Your device has been successfully installed and is ready to use".
No software installation is required, and the driver is included with Windows.