Installation Crashed!!

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http://forums.fedoraforum.org – Hi everyone, well my problem is this: I had Fedora 15 installed on my computer and want to upgrade to Fedora 17, but in the middle of the installation process it crashed because of some error, and then click to exit the installator. But when I decide to restart the computer and try to see if Fedora 15 was still there, it wasn't, and I assume that the Fedora 17 installation erase the files or something. And when I put the Fedora 15 DVD in the cd/dvd tray and reboot (to start a fresh new installation of Fedora), the computer show the next: Attempting to boot from CD-ROM... Attempt (HowTos)