Arduino 1.6.8 - no usb found

On using the avrisp mk2 programmer i am getting this message.

i have the same issue with IDE 1.6.5 and also using Winavr Programmers Notepad

avrdude: usbdev_open(): did not find any USB device "usb"

OS is win7 and i have Studio7 installed - the avrisp mk2 has the Jundo driver assigned in device manager.

There seems to be a conflict between the jungo and libusb drivers - is there a solution without uninstalling Studio7?

Arduino IDE is not compatible with the jungo driver but you may also encounter this error even when you are using the correct driver. See for details and workarounds.