Please Help - glx

[Danny Tiberman <tiberman@macbeth.ls.huji.ac.il>]

I have a Debian Linux 2.6.18-4-amd64 #1 SMP
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 4800+

/proc/driver/nvidia/cards> more 0
Model:           GeForce 7300 GS
IRQ:             50
Video BIOS:      05.72.22.34.00
Card Type:       PCI-E
DMA Size:        39 bits
DMA Mask:        0x7fffffffff
Bus Location:    03.00.0

taken from /var/log/Xorg.log:

(II) Module freetype: vendor="X.Org Foundation & the After X-TT Project"
       compiled for 7.1.1, module version = 2.1.0
       Module class: X.Org Font Renderer
       ABI class: X.Org Font Renderer, version 0.5
(II) Loading font FreeType
(II) LoadModule: "glx"
(II) Loading /usr/lib/xorg/modules/extensions/libglx.so
dlopen: libGLcore.so.1: cannot open shared object file: No such file or 
directory
(EE) Failed to load /usr/lib/xorg/modules/extensions/libglx.so
(II) UnloadModule: "glx"
(EE) Failed to load module "glx" (loader failed, 7)


(II) Module freetype: vendor="X.Org Foundation & the After X-TT Project"
       compiled for 7.1.1, module version = 2.1.0
       Module class: X.Org Font Renderer
       ABI class: X.Org Font Renderer, version 0.5
(II) Loading font FreeType
(II) LoadModule: "glx"
(II) Loading /usr/lib/xorg/modules/extensions/libglx.so
dlopen: libGLcore.so.1: cannot open shared object file: No such file or 
directory
(EE) Failed to load /usr/lib/xorg/modules/extensions/libglx.so
(II) UnloadModule: "glx"
(EE) Failed to load module "glx" (loader failed, 7)


(II) Module freetype: vendor="X.Org Foundation & the After X-TT Project"
       compiled for 7.1.1, module version = 2.1.0
       Module class: X.Org Font Renderer
       ABI class: X.Org Font Renderer, version 0.5
(II) Loading font FreeType
(II) LoadModule: "glx"
(II) Loading /usr/lib/xorg/modules/extensions/libglx.so
dlopen: libGLcore.so.1: cannot open shared object file: No such file or 
directory
(EE) Failed to load /usr/lib/xorg/modules/extensions/libglx.so
(II) UnloadModule: "glx"
(EE) Failed to load module "glx" (loader failed, 7)


taken from /etc/X11/xorg.conf:

Section "Module"
       Load    "bitmap"
       Load    "dbe"
       Load    "ddc"
       Load    "dri"
       Load    "extmod"
       Load    "freetype"
       Load    "glx"
       Load    "int10"
       Load    "vbe"
EndSection

Section "Device"
       Identifier      "nVidia Corporation G71 [GeForce 7300 GS]"
       Driver          "nvidia"
       BusID           "PCI:3:0:0"
       VideoRam        212144
EndSection


Please
where to look or what to do in order to install glx.


Thanks in advance.