uname -a
Linux 82-160-67-69.ols.vectranet.pl 2.6.11-6mdk #1 Tue Mar 22 16:04:32 CET 20 i686 AMD Athlon(TM) XP 2400+ unknown GNU/Linux
#urpmi kernel
The package(s) are already installed

Try installing the nvidia drivers now.

still the same errors :/

i'm having the same trouble see if this helps...
open a terminal and type rpm -qa | grep -i kernel.. that should list all of the kernel software installed
uninstall all but kernel-2.6.11.6mdk-1-1mdk (goto menu/system/configuation/packaging/remove software.
type in kernel hit seach button then remove.. then go here to download kernel-source-2.6-2.6.11-6mdk http://rpmfind.net/linux/RPM/mandrak...6mdk.i586.html install this after in downloads.
then run the nvidia-linux file as per nvidia




I used kernel-source-2.6-2.6.11-6mdk
I had kernel-source-2.6-2.6.11-12mdk

The difference in versions if because kernel updates are not automatically installed in Mandriva, whereas the kernel-source package is automatically updated when you run MandrakeUpdate.

To update to the latest kernel do:
Then reboot

That's right, you have to make the versions of kernel and kernel-source match. It might be the problem of our urpm sources, which just don't carry the newest kernel version for whatever reasons. The newest version of kernel I can get is also 2.6.11.6mdk-1-1mdk, however the newest version of kernel-source is 2.6.11-12mdk, apparently that's 6mdks of difference there! So, you need to grab kernel-source-2.6.11-6mdk instead, which is provided by Dsoyertoy's post, I stole the URL here for your convenience:

http://rpmfind.net/linux/RPM/mandrake/.../kernel-source-2.6-2.6.11-6mdk.i586.html

Everything will be fine afterwards based on my experience. By the way I did update local urpmi.cfg.