Ubuntu 12.10 graphic driver problem

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http://askubuntu.com – Firstly i would like to say sorry for my bad grammar. I've got singtech lap top, model-w251hp, with nvidia gt520m 1GB graphic. I installed ubuntu 12.10 yesterday and try to update. But I can't find nvidia driver in Settings/Software Sources/Additional Driver/. so ii typed the following command that i found in some forum. sudo apt-get install nvidia-current nvidia-settings after the reboot, my desktop has gone :( . no side bar.. no keyboard icon or time on top right corner. everything except the desktop background has gone. but i can still press ctr+alt+t and can open terminal. and type firefo (HowTos)