Problem Installation

Hi I have a problem with installation, appears me this message “Some firstboot error occured, and the system is not properly setup. Check to see if you have internet access and re-run /etc/ Press ctrl-alt-f1 to continue”, my pc is connect to internet, I don’t understand this message. Also nothing happens when click ctrl-alt-f1. My pc is x32 bit and I have Installed the free pbx distro Stable-2.210.62-6, how can I do?

Also tried Stable-2.210.62-6 Release Date-03-17-13

i have found that if the cd is a bit dirty or scratched it can cause weird errors