I've been reading about this problem for month and still can't figure it out .

I downloaded NVchooser then download excat Drivers. Extracted Drivers Successfully .Then added Lines from NVidia Help In My XF86Config file The Exact output was :
"Unknown Modules dbe , extmod , glx , type1
No Modules in /usr/X11R6/lin/Modules/ "
But it started the XWindows Using FBDev and it's drivers .

After That I edited Display Section and Added My NV AGP Device Like Sample in /doc
And changed Device In Screen Section to "NV AGP" Like Display Identifier I just added ,
Themn Ran "startx" and It finally gave me :
"nvidia driver not found"
And this is the driver name I added in Display Section .

Tell PLEASE What Else to do
I'm out of resources and Now I'm sending This From Windows XP.

Thanks

It sounds, that you doesn't compile the drivers. You wrote, you have extract the drivers, but how have your compile them? Have you downloaded a *.tar.gz or install a *.rpm File?

Well, you need to find NVdriver and modprobe it.
Try modprobe NVdriver and if it goes without errors try startx
If it complains that it can not find NVdriver then locate NVdriver and move it to /lib/modules/KERNEL-VERSION/kernel/drivers/video/NVdriver (i might have made a mistake in that path, but you get the point where it should go) and this time it should modprobe without problems
HTH
-NSKL

Actually I Used rpm :
$rpm -ivh NVIDIA.Kernel.......
$rpm -ivh NVIDIA.GLX.......

there are 2 types of modules - kernel and XFree ((X11R6).
The kernel driver is NVdriver - lsmod|grep NV should show it .
The others (e.g., . dbi,dri ) are X11R6, shoud be in /usr/X11R6/lib/modules
and /usr/X11R6/lib/modules/extensions.

The driver name in /etc/X11/XF86Config-4 is: Driver "nvidia"
in /usr/X11R6/lib/modules/drivers/nvidia_drv.o