Can someone help in installing Linux live vaio cd?

I have a Sony Vaio Z and I'm trying to install Linux live 12.5. And gives me an error of "unable to find a medium containing a live file system". The specs of my Vaio are i5, 4G Ram, 1G Video card and 1TB HD. I tried to install it on another computer and it works fine. Can someone help me in installing Linux live via CD?
