BLINKING LED AND GETTING STARTED PROBLEM IN AREDUINO

This was my first Arduino program. The simplest: Blinking LED!

Yes it might sound very easy for a person whose done a couple of experiments. But for an absolute beginner, I faced these few problems.

1) The driver was not finding COM5/COM6 PORT.
2) When I was done with the first problem, a new problem came out. COM 6 is already in use.

How to solve it. 
1) Search for VCP drivers.
2) Download the compatible driver according to your OS.
http://www.ftdichip.com/Drivers/VCP.htm

3) Then watch this video

https://www.youtube.com/watch?v=Ozrxs7rIeRM

FOR BLINKING LED

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the Uno and
  Leonardo, it is attached to digital pin 13. If you're unsure what
  pin the on-board LED is connected to on your Arduino model, check
  the documentation at http://arduino.cc

  This example code is in the public domain.

  modified 8 May 2014
  by Scott Fitzgerald
 */


// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin 13 as an output.
  pinMode(13, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);              // wait for a second
}