why update fail?

[Edward King]

I use Redhat Linux 7.3, I want to update kernel,so I use following commands,but it raise errors:
[root at mail guest]# rpm -ivh kernel-2.4.20-28.7.i686.rpm
error: failed dependencies:
        modutils >= 2.4.18 is needed by kernel-2.4.20-28.7

Then I guess to update modutils first,like follows,but it still raise errors:
A[root at mail guest]# rpm -ivh modutils-2.4.18-3.7x.i386.rpm
Preparing...                ########################################### [100%]
file /sbin/depmod from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /sbin/genksyms from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /sbin/insmod from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /sbin/insmod.static from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /sbin/modinfo from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man1/kernelversion.1.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/create_module.2.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/delete_module.2.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/get_kernel_syms.2.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/init_module.2.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/query_module.2.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man5/modules.conf.5.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/depmod.8.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/genksyms.8.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/insmod.8.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/kallsyms.8.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/ksyms.8.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/lsmod.8.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/modinfo.8.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/modprobe.8.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/rmmod.8.gz from install of modutils-2.4.18-3.7x conflicts with file from package modutils-2.4.14-3

Any I try another modutiles,it still failed:
[root at mail guest]# rpm -ivh modutils-2.4.20-1.i386.rpm 
Preparing...                ########################################### [100%]
file /sbin/depmod from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /sbin/genksyms from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /sbin/insmod from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /sbin/insmod.static from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /sbin/modinfo from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man1/kernelversion.1.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/create_module.2.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/delete_module.2.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/get_kernel_syms.2.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/init_module.2.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man2/query_module.2.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man5/modules.conf.5.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/depmod.8.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/genksyms.8.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/insmod.8.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/kallsyms.8.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/ksyms.8.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/lsmod.8.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/modinfo.8.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/modprobe.8.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3
file /usr/share/man/man8/rmmod.8.gz from install of modutils-2.4.20-1 conflicts with file from package modutils-2.4.14-3


How to solve this problem?

Thanks in advance!