I'm not sure if your card (or integrated graphics) are sopported by the proprietary Nvidia drivers.
[ 28.490] (II) VESA(0): VESA VBE OEM Vendor: NVIDIA Corporation
[ 28.490] (II) VESA(0): VESA VBE OEM Product: NV34 Board - p162-11n
Could you post the result of these commands?
lspci -nn | grep -i vga
sudo lshw -C display
BTW, you may revert to the previous state by replacing you configuration file with the old one:
sudo cp -f /etc/X11/xorg.conf.old /etc/X11/xorg.conf
(Good thing we backup the file before, isn't it?)