[fedora-india] problem using yum

[gaurav agrawal]

I am using Fedora 12 electronic lab spin. when i try to install or update
anything using yum nothing happens after 'Loaded plugins: presto,
refresh-packagekit '
furthur i am unable to open some of the websites(www.youtube.com,
www.iitr.ac.in) in fedora(firefox) while the same opens in windows under
firefox.
Help
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