Problem with the driver installation of INDUINO R3 in win 8.1

i am unable to install the INNDUINO R3 board in my windows 8.1... even after i installed its drivers its port is not being assigned... can anyone help me in this regard...?

control panel> Device manager > click on that driver then proprieties then update manually then go to c:> program files (x86) > arduino > drivers then chose the driver for your arduino