Novice having problem upgrading to F19

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http://forums.fedoraforum.org – I am trying to upgrade from F17 to F19 using fedup. My computer is an older Emachine with 3.2 Ghz Intel Celeron D processor and 2 Gig of memory. I have backed everything up in case I mess this up. Fedora 17 is the first and only Linux version I have been able to get to run on this machine so I am happy with it and have been using it for several months now. I installed fedup using this command: yum --enable repo=updates-testing install fedup That seemed to work fine and gave no problem as far as I could tell. At least it said it was installed OK. I then tried to install the upgrad (HowTos)