I have new to Linux and I've installed Redhat 9.
Overall, it works fine but I have two problems.
First, after I've upgrade the kernel as the RedHat network recommeded, I got multiple kernels at startup. It seems that when a kernel is upgrade, the previous kernels are kept. Is there a way to get rid of previous kernels?

Second, when I tried to install samba using "System Settings/Add or Remove Packages" to use a printer hooked up other windows 2000 computer, I failed because the RedHat 9 couldn't find the openssh-3.5p-6. However, with the "rpm -q opeenssh" command, I found that my RH9 installation has openssh-3.5p1-6.9 installed.
How can I fix these problems?

Thanks in advance.

To remove your old kernel do a simple 'rpm -e'
Do a 'rpm -qa | grep kernel' if you don't know the name of the package(s) (you may have source too).

To get rid of the previous kernels from the boot loader you will need to edit your conf file.

As for the other problem, i have no clue...

ive updated my kernel as well from the redhat network from kernel-2.4.20-8 to kernel-2.4.20-20.9
just wanted to know how safe it is if i remove my old kernel?

yu should keep it for a while till you're sure everything that was working in the previous one works in the new one.
if yes, you can remove the old one.

grab and install these updated samba packages :

samba-2.2.7a-8.9.0.i386.rpm
samba-client-2.2.7a-8.9.0.i386.rpm
samba-common-2.2.7a-8.9.0.i386.rpm

from your closest redhat mirror

as for the kernel question yea you should keep it until you're sure everything works in the new kernel. If you're like me who's annoyed to see these old kernels in the bootloader, you're quite safe to remove the entries from /boot/grub/grub.conf. If you need to boot the old kernel you can use the grub shell to manually boot it.