The kernel can't be changed while the machine is running. Switching to a new kernel is one of the very few things that linux actually requires a reboot for. If grub has the info for the new 2.6.11 kernel, all you need to do is reboot and let grub choose the 2.6.11 kernel.
Also, I wouldn't remove the old kernel info until you're sure the new one does everything you want. Even then, it is no problem to have multiple kernel choices, unless you're on the tiniest of small drives.
Last edited by JimBass; 05-30-2005 at 06:40 PM.