The first step in installing SQL Server 2012 is, of course, to launch the SQL Server Installation Center. You do this by inserting the install DVD in the drive and double-clicking setup.exe in the root folder (if AutoPlay is enabled, setup runs automatically). If you’re installing from a decompressed .iso file or network share, locate the root folder and double-click the setup.exe file in the root folder.
If any prerequisites for the Installer need to be installed, you will likely need to restart the computer for the updates to take effect. After restarting, rerun
setup.exe to continue the installation.
After any missing prerequisites are installed, the Installation Wizard runs the SQL Server Installation ...