Installing SQL Server 2012 on your computer is very easy. Just follow the steps below :
1. Head over to http://www.microsoft.com/en-us/download/details.aspx?id=29066 and download the SQL Server 2012 iso file.
2. Then mount this ISO file in a virtual DVD drive with the help of Power ISO or a similar software.
3. Double click on the mounted drive and follow the intallation process.
Alternate way :
If you are having these three files instead of a single ISO :
Then, click on the SQLFULL_architecture_language_Install.exe file to begin the installation process of SQL Server 2012.