Instalar Leonardo R3 en Windows 7 x64
My Arduino UNO Rev 3 and Windows 7 64 bit Installation “Unknown Device”
The installation was not easy or obvious. I am new to Windows 7, so that doesn’t help either.
Simply updating the driver with “Arduino UNO” on this Unknown Device did not work.
I the tried these 10 steps and it worked for me. Your mileage may vary.