Big F12 disaster after nvidia driver install

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http://forums.fedoraforum.org – I enabled rpm-fusion installed nvidia drivers from it and minor kernel update and this ended up with no GUI at all. To make things worse even when I tried old kernel just many colorful lines after boot and system crashed so badly that even no command line was available. :( I use KDE edition 64 bit and GF9800GTX card. Plz help me fix this. (HowTos)