you are aware that fedora 12 is an UNSUPPORTED version
it is dead .
Fedora 12 hit "End Of Life " Jan 2 2011
there will never be any support for it ever again .
NO updates ,NO security fixes , NO new software , NO nothing .
please stay current and install fedora 14 first
if for some odd reason you can NOT use a supported OS and MUST use a DEAD /EOL version
see this forum section
"EOL (End Of Life) Versions"
http://forums.fedoraforum.org/forumdisplay.php?f=75
but fedora 12 will NEVER have any updated or new software .