When installing the Atmel JTAGICE3 on a computer running Microsoft® Windows®, the USB driver is loaded when the JTAGICE3 is first plugged in.
Proceed with the default ("recommended") options through the New Hardware Wizard.
If it is not detected automatically, point the wizard to the device driver (provided by Jungo) called jtagice3.inf which is stored in the <windows_root>\inf folder.
Once successfully installed, the JTAGICE3 will appear in the device manager as a "Jungo" device.
Your JTAGICE3 is now ready to use.