Kernel Error (Big problem :D)

This isn't quite security related, but it can be... I update RH9, but when I try to install the NVIDIA drivers I get an error saying

Quote:

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Unable to find the Kernel header files for the currently running Kernel. Please make sure you have installed the Kernel header files for your Kernel; on red Hat Linux systesm, for example, be sure you have the 'Kernel Source rpm installed. If you know the correct Kernel header files are installed, you may specify the Kernel include path...

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I have used up2date, and I have manually installed 'kernel-2.4.20-20.9.src.rpm' Is there way that I can at least remove the new Kernel to save space?


-It is I, me-