program not uploading in arduino

Hi, First time i am downloading the arduino software.But the drivers not extracting and installing as shown in "get started page".When I conect the board "new hardware found"page is too not opening.As board connected,the serial port is not shown in IDE.After uploading it shows error.Pls help me.....I am searching the solution for a long time.

this is my error: Arduino: 1.6.5 (Windows 7), Board: "Arduino Uno"

avrdude: Version 6.0.1, compiled on Apr 15 2015 at 19:59:58

Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

Copyright (c) 2007-2009 Joerg Wunsch

System wide configuration file is "C:\Users\ADMIN-PC\Arduino\hardware\tools\avr/etc/avrdude.conf"

Using Port : COM3

Using Programmer : arduino

Overriding Baud Rate : 115200

avrdude: ser_open(): can't open device "\.\COM3": The system cannot find the file specified.

avrdude done. Thank you.

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

i have actually selected com2.but the erroe shows com3

I think my drivers are not installed. This is the photo of my devies manager