Ok, lets get an example.
Well, guys, please read the doc from start to end!
You must REMOVE the load "dri" line.
Mandrake 8.2 starts to get old, and its driver for nvidia does not include the lastest geForce4.
So, it's why by default, you have only generic vga detected.
=> Ok, you may have difficulties to understand what nv says in their doc.
So, I suggest you to take nvidia sample config-file.
It must be found here (if you have correctly installed nvidia package):
/usr/share/doc/NVIDIA_GLX-1.0$ ls -latr
drwxr-xr-x 3 root root 4096 Jun 28 11:11 include
drwxr-xr-x 3 root root 4096 Jun 28 11:11 .
-rwxr-xr-x 1 root root 5404 Jul 9 11:20 license.txt
-rwxr-xr-x 1 root root 7287 Jul 9 11:20 XF86Config.sample
-rwxr-xr-x 1 root root 106713 Jul 9 11:20 README.DE
-rwxr-xr-x 1 root root 102837 Jul 9 11:20 README
-rwxr-xr-x 1 root root 11679 Jul 9 11:20 NVIDIA_Changelog
drwxr-xr-x 772 root root 20480 Aug 13 16:41 ..
(please, have a good look at README file)
Then, make a backup of your own XF86Config-4 file, copy this XF86Config.sample in place of your XF86Config-4, change it if needed (take care at your display frequencies if it is a 'non-standard' one).
It may be better.
If it still doesn't work, or if you think it's too hard for you, send me your XF86Config-4 file, I'll get a look at it, change it if needed, comment it, and you'll stop asking things about it pretending it doesn't work!
(But try it by yourself first, you'll learn more.)