F10 Installation: Unable use Add/remove packages or Yum

[Daniel B. Thurman]

F-10 Repository:
Fedora 10 - i386
Fedora 10 - Updates

1. Add/Remove Software:
No results were found.
Try entering a package name in the search bar.

2. Yum update
Loaded plugins: refresh-packagekit
Could not retrieve mirror list 
http://mirros.fedoraproject.org/mirrorlist?repo=fedora-10&arch=i386 
error was
[Errno 4] IOError: <urlopen error (-2, 'Name or service not known')>
Error: Cannot retrieve repository metadata (repomd.xml) for repository: 
fedora,
Please verify its path and try again.

What do I need to do to fix this, please?

[ Notes:
1) I had to type this all out by hand - could not get Places->Networks
    working, no matter what I tried.  Network access to LAN works, but
    somehow, browsing of network via SMB does not work, and yes, I did
    use the System->Administration->Authentication SMB settings
    as there was nothing else available that I can see to configure
    smb, other than manually editing the /etc/samba/smb.conf file,
    but even my changes to this file does not seem to work either.

2) Gparted would have been a nice addition to the LiveCD as I
    use it regularly to prepare the drive before handing it off to
    the installer, imo.
]