nVidia Driver still doesn't working

Hello everybody


After read and put on practice many tutorials on the web, i can't 
install nVidia driver for GeForce GT-540 video card.
It is on toshiba p750 laptop, running Debian Buster.

  * First I installed "nvidia-detect" and it returns that I have to
    install the package "nvidia-legacy-390xx-driver".

  * Then I run "apt-get install nvidia-alternative
    nvidia-legacy-390xx-driver", after that I rebooted the laptop.

  * I run "update-glx --config nvidia", everything ok.


The problem now is when I try to use "NVIDIA X Server Settings" the 
program show me a dialog box containing "You do not appear to be using 
the NVIDIA X driver. Please edit yout X configuration file (just run 
'nvidia-xconfig' as root), and restart the X server"

(*) I had some bad experiences with 'nvidia-xconfig', after that 
probably next boot time it will show a blank screen.

  * I was looking for "xorg.conf" in "/etc/X11" and realize that there
    is not present, so i used this solution:
    https://fedoraproject.org/wiki/How_to_create_xorg.conf


Then I modified on /etc/X11/xorg.conf:

Section "Device"
         Identifier  "Card1"
         Driver      "nvidia" =======================> it was "nouveau"
         BusID       "PCI:1:0:0"
EndSection

nVidia Driver still doesn't working.


thanks for your support.

-- 
César Tapia