It's a rather annoying bug.
i'm sad because nothing work with nvidia driver installation steps.
here is what i did:1st test:suyum update kernel\* selinux-policy\*rebootsuyum --nogpgcheck install http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpmyum install akmod-nvidia xorg-x11-drv-nvidia-libs.i686
i get the following error message:GPG key retrieval failed: [Errno 14] Could not open/read file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-non-fedora-18-x86_64