Did you buy RHEL? If so, you even have free support, you might try that.
You don't need to remove the old kernel. If you want to make shure you booted with the right one, you can type "uname -r".
You can easily remove the old ones with the rpm, but you don't need to. I would suggest you keep it in case the new one gives you problems... If you keep it installed you just have to choose the old one from grub at startup, or put it on top of your menu.lst - if you're using gurb.
Last edited by oskar; 02-13-2007 at 12:15 PM.