Hi Raj,
I've been in such situations a number of times. The good news is that (other than in Windows) the problem can usually be solved without re-installation.
I think your /etc/X11/xorg.conf has some problem. Why don't you just move it out of the way with e.g.
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.dontuse
and reboot? That should give you a working desktop, from which you can start over, i.e. re-installing Nvidia and then running nvidia-xconfig (or is it nvidia-settings - I tend to confuse those two).
HTH,
Kay
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