Be cautious, Fedora Core (from my experiences) is a bit like windows, you are the beta tester for their "final" release. I love redhat 9 because it was one of my first distros. The only reason me and my friends ditched it was because "mandrake was so much better" which we all know now is stupid. I find it useful to have an RPM distro laying around, so I keep redhat 9 on one of my partitions. It's a great middle-road distribution.
Btmiller is right, probably an install cd problem, bad burn or bad download. I had similar probs. If you are using Firefox 1.0 I think it is, it has trouble with large file downloads, so switch to 1.04 or whatever the newest version is.
Need further help? Wanna switch to Slackware? Just post back!!
best of luck,