might be a better place to look for idea's and suggestions ?
Personally, I can't really help, not being familiar with fedora.
Though it look's like you've probably got the 2.6.6 kernel version installed, but your boot set up is pointing to the older 2.6.5 version (which is also installed)
You could maybe try and see, by looking at the grub.conf or lilo.conf (for whichever boot loader you use) and see what it's pointing at, then just change the number to whatever the file is called and then do a search in either nautilus or konqueror (again depending on what window manager/desktop environment you use).
I don't know how update's work with fedora, because with mandrake I can do it with their urpmi facility - you may actually have a similar facility available to you.