Arduino pro Micro Communication Issues
You're not the only one having this problem. I think this is the post that you can read to solve this problem.

Try doing this :

First install drivers for Arduino ( This is for Windows 8 or 7 ) :


Plugin your Arduino Board
Go to Control Panel ---> System and Security ---> System ---> On the
    left pane Device Manger
Expand Other Devices.
Under Other Devices you will notice a icon with a small yellow warning. (Unplug all your other devices attached to any Serial Port)
Right Click on that device : Update Driver Software
Select Browse my computer for Driver Software
Click on Browse : Browse for the folder of Arduino Environment
which you have downloaded from Arduino website. If not downloaded
then http://arduino.cc/en/Main/Software
After Browsing mark 'include' subfolder.
Click next ---> Your driver will be installed.
Go to device manager Expand Port ( its under the other devices )


You will see Arduino Written ---> Look for its COM PORT (close device manager)


Go to Arduino Environment ---> Tools ---> Serial Port ---> Select the
COM PORT as you just saw in PORT in device manager. (If you are using
any other Arduino Board instead of UNO then select the same in boards
)


Thats it btw. these instructions are by @Divye Bhutani in his original post. . .