upgrading kernel (Score 1)

I am having a problem with setting up kernel 2.2.3. I have RedHat 5.2 with the 2.0.36 kernel. Everytime I have compiled the kernel and reboot it gets to the part where it says VFS, says it can't mount the root filesystem and gives me a kernel panic. I'm using a quantum 4.5 ultra-wide harddrive with an advansys scsi controller. It would be greatly appreciated if someone could give me some help on this.