Need help upgrading from Fedora 7

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http://forums.fedoraforum.org – Hi, I'm a beginner to Linux. I installed Fedora v.7 a couple months back on a Dell desktop (dual boot with WinXP). I am trying to upgrade to the latest version now and having some problems. I tried to upgrade to Fedora v 10 using yum update, but get the following error: "Cannot find a valid baseurl for repo: anaconda-upgrade-install". I then downloaded Fedora 18 iso image for x386, burned it to a cd and tried installing that way. I'm able to boot from the cd, it comes up to the Fedora screen and then says "An unexpected error has occurred". My options at this po (HowTos)