3.2.2 Install New Hardware on the Computer
When Atmel Studio and USB driver installation is finished, attach the USB cable to both the PC and the Atmel AVR Dragon. (The AVR Dragon is powered from the USB.) If it is the first time the AVR Dragon is connected to the computer, the box below will appear:
If running Windows XP you need to click "Next" a couple of times. Wait until the installation process completes by itself. It may take from a few seconds up to a few minutes depending on the computer and operating system.
If the USB driver is correctly installed and AVR Dragon is connect to the PC, the green LED next to the USB connector will be lit.
If the software front-end for some reason can't detect the AVR Dragon after the USB setup, try to restart the computer in order to get the driver properly loaded.