If you've just installed the OS for the first time and haven't run 'yum update', you should do this to resolve the problem. (known bug in F10)
Can you get the machine on the network long enough to do an update?
If not, I can walk you through editing your ifcfg-eth0 file manually (please post your current file so I can show you what it should be). Also include what IP, netmask, gateway, and DNS server settings should be... the file is located at /etc/sysconfig/ifcfg-eth*