Download CentOS 7
1] This is the configuration Examples for CentOS 7.x that is compatible with Red Hat Enterprise Linux 7.x.
Download the CentOS 7.3 ISO file for installation from the following site.
Create an Installation disk for CentOS 7
After downloading ISO of CentOS 7.x, Burn it to a DVD with an burning application to create an installation disk. If you create it with the function of Windows 7/8/10, refer to follows.
 Insert an empty DVD first. Next, click right button of the mouse and select "Burn disk image".
 Click "Burn" button and start burning
 After finishing burning, eject the disk and proceed to the installation.