(solved ) problem with serial port Arduino uno on Window 8.1

Does anyone know how to fix it to communicate between a computer and an Arduino?

check it out the video problem with serial port Arduino uno on Window 8.1 - YouTube

I am not used to new Window 8.1 installing new Arduino. I totally forget how to using it. It was not same as Window 7. not too much difference. I am wondering anyone willing to help it out and i will very appreciated so much. I cant wait to get started! please thanks.

the solved was

http://forum.arduino.cc/index.php?topic=205882.0