UPLOADING PROBLEM

I am new to this Arduino world.
I got my first Arduino, UNO R3 // ATMEL 1649 // ATMEGA328-PU
I am trying to upload a simple program
I’m using Arduino 1.8.2 IDE
Win 10(64 bit)
But it keeps giving an error message as

avrdude: verification error, first mismatch at byte 0x0000
0x62 != 0x0c
avrdude: verification error; content mismatch

There is nothing attached to the board(other than the USB cable of course),

Several people have solved this by burning the bootloader.

https://forum.arduino.cc/index.php?topic=453997.0