Problem uploading the code to my Arduino Uno R3

ever since I upgraded my arduino IDE to 1.6.7, I am not able to upload my code to the board. I am getting the error message as mentioned below. Is anyone else having the same issue or it's just me?
Any suggestions for troubleshooting would be greatly appreciated. Thanks.

Arduino: 1.6.5 (Windows 8.1), Board: "Arduino/Genuino Uno"

Sketch uses 1,030 bytes (3%) of program storage space. Maximum is 32,256 bytes.

Global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes for local variables. Maximum is 2,048 bytes.

avrdude: ser_open(): can't open device "\.\COM5": The semaphore timeout period has expired.

Problem uploading to board. See for suggestions.

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.