i am able to fix this problem very easily... just press reset button on arduino and unplug from usb and go to the arduino software installation directory (c:/program files/ arduino) and open drivers folder and open
dpinst-amd64 by double clicking on it and just install that if it not runs may be your system runs with 32bit and open the file below the previously opened file and install it again.. close arduino programming software and open it again and choose your board and com ports and now it should upload to your board...enjoy...
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