Xlib: extension "GLX" missing on display ":0.0"?

Hello dear community,
I ask this question because i don't know how to brief it differently.
I need support about my video card because it is having trouble.
I try to give needed informations.

/etc/X11/xorg.conf

guillaume@python:~$ cat /etc/X11/xorg.conf
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder63) Tue Nov 4 14:07:17 PST 2008

# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# Note that some configuration settings that could be done previously
# in this file, now are automatically configured by the server and settings
# here are ignored.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

Section "ServerLayout"
    Identifier "Default Layout"
    Screen "Default Screen" 0 0
    InputDevice "Keyboard0" "CoreKeyboard"
    InputDevice "Mouse0" "CorePointer"
EndSection

Section "Module"
    Load "glx"
EndSection

Section "InputDevice"
    # generated from default
    Identifier "Keyboard0"
    Driver "keyboard"
EndSection

Section "InputDevice"
    # generated from default
    Identifier "Mouse0"
    Driver "mouse"
    Option "Protocol" "auto"
    Option "Device" "/dev/psaux"
    Option "Emulate3Buttons" "no"
    Option "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
    Identifier "Configured Monitor"
EndSection

Section "Device"
    Identifier "Configured Video Device"
    Driver "nv"
EndSection

Section "Screen"
    Identifier "Default Screen"
    Device "Configured Video Device"
    Monitor "Configured Monitor"
    DefaultDepth 24
    Option "NoLogo" "True"
    SubSection "Display"
        Depth 24
        Modes "nvidia-auto-select"
    EndSubSection
EndSection