Thanks for the help. I tried both options but I still get the same error message.
# yum install fedora-release-5-5
Gathering header information file(s) from server(s)
Server: Fedora Core 5 - i386 - Base
retrygrab() failed for:
h_ttp://download.fedora.redhat.com/pub/fedora/linux/core/5/i386/os/headers/header.info
Executing failover method
failover: out of servers to try
Error getting file h_ttp://download.fedora.redhat.com/pub/fedora/linux/core/5/i386/os/headers/header.info
[Errno 4] IOError: HTTP Error 404: Not Found
You can see with the browser that the file
download.fedora.redhat.com/pub/fedora/linux/core/5/i386/os/headers/header.info
does not exist.

Any ideas ?