Originally Posted by Munkey_Boi
Fom the commands supplied:
[matt@localhost matt]$ rpm -qa l grep kernel
That can't be correct. Could you try that again? If you do not see anything with "kernel" and "kernel-source" or something similar (there should be a reference to your kernel version 2.6.3-4mdkenterprise), you have to install them. Once you've done that, you could have another go at installing the Nvidia driver.
If this fails, or the kernel rpms were already installed, try to locate the file /usr/src/linux/include/linux/version.h, or /lib/modules/2.6.3-4mdkenterprise/build/include/linux/version.h -- if none of these are present, you will have to compile the kernel. (If you get to this point and you need help, let me know.;-)