PC won’t boot from dvd?

I started re-installing WINDOWS XP, formatted my hard drive, and half way through the installation a message came up, saying that the cd is corrupted and the installation process can’t proceed. I restarted the PC, and tried to install a copy of WINDOWS 7, but the PC doesn’t even see any files on that cd. I got a message that it can’t boot from cd – code 5. Afterwards, i tried installing from a flash drive, from three other cd’s with windows 7 and xp, and nothing worked. Any suggestions?