Install CentOS 7 on Virtualbox

1. Download CentOS 7
 http://isoredirect.centos.org/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1511.iso
2. Download Virtual Box for Windows
http://download.virtualbox.org/virtualbox/5.1.8/VirtualBox-5.1.8-111374-Win.exe
3. Open Virtualbox