NEED HELP,JUST PURCHASED A NEW STARTER KIT AND UPLOAD ERRORS.

i just purchased a new arduino starter kit(the official one)and i tried some example sketches.
it complies correctly but when it comes to uploading it says this:
Arduino: 1.6.4 (Windows 7), Board: "Arduino 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 "\.\COM11": The device is not connected.

Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

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

I HAVE plugged in the arduino board all fine and selected COM 12 (windows 7 user)
i also have the latest arduino software.
pls help ARDUINO

Are you sure you selected the correct port? You stated in your post that you selected com port 12, however, the error outputted by the ide references port 11.

i meant 11

Okay.... Doubt it will work but have a go at the loop-back test. The instructions for this test can be found at the top of this sub-forum.

You can try is using the old arduino drivers. These can be found inside an archive called "old arduino drivers" in the install directory. Another alternative is using an older version of the ide (pre 1.6.x), these versions use the old drivers and are more "stable" in my opinion.

k i will try

Is COM11 is showing up in Tools>Port?