If you are using FEDORA18 and are having some problem with this error .....
"RPMFusion Error GPG Key retrieval failed: [Errno 14]"..............
Here is the Solution....:)
Solution:
Just write the below code in terminal....
su -c 'yum localinstall --nogpgcheck http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-branched.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-branched.noarch.rpm'
Dats it...your problem is solved...:D