HI Due to incompatibility of kernel 2.6.5336 with Nvidia Driver, so I put kernel 2.6.6 instead. But the problem is that I can't install updates from RH network. There was the following message appears when I click to Alert Icon:"You are running kernel-2.6.6, but it is not installer in RPM formats. It highly recommended that you run the official Red Hat kernels. By running a custom kernel, you will miss out on any security fixes and functionality enhancements and your configuration is unsupported." Can this be corrected???