unable to install with yum in fc6 xp_64

I am a starter in linux fedora. I have recently installed fedora core 6
xp_64 in my notebook with AMD64 Turion. I want to load emacs, mplayer and
other extras. If i give yum install emacs i get the message in my terminal
that Error: Cannot open/read repomd.xml file for repository : livna     and
keeps on trying other mirror before returning to terminal command prompt.
Also I am not able to view my Applications --> Add/remove software , it
finally returns as unable to retrieve software information
I doubt whether yum is properly installed in my system. Please suggest me to
get over this

Thanks

Balu

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