I got new Arduino Uno r3 board.
Installed Arduino IDE latest version.
Then I connected the board to computer (running on Windows 10) .
Wrote the blink LED example and tried to upload the program.
It showed the error that board not found at com 1.
I went to device manager and there it showed "ATMEGA 16u2 DFU" under other devices.
How to fix it.. Please consider me beginner to Arduino 