I had the same prob.
Try to install nvidia driver from console:
Check to see if your card is compatible.
If it is then download 100.14.19 driver onto a usb thumbdrive. Let it boot with the thumbdrive attached then after you login
cd to /mnt/thumbdrivename (type mount if you do not know the name)
sh NVIDIA-Linux-x86-100.14.19-pkg1.runFollow the on screen guide and let it create a new xorg.conf
Don't thank me thanks goes to PrairieFire