Have re downloaded your automatic installer , extracted it., selected about 5 drivers (including the two boards which I have and the program then tells me that they are installed OK. However they do not seem to be. The device manager still displays unknown device (with no driver). Again if I then try to update the driver and select the driver folder I get the original error message. If I try to upload a sketch (i.e. Blink it compiles OK then when it gets to upload it simply hangs !