yum installatin

hi guys
i am new in installation of yum in cent os 5.0
i have tried to install yum on centos 5 server

i have followed the following steps 

download this  files in \
     gmp-4.1.4-10.el5.i386.rpm \
     readline-5.1-1.1.i386.rpm \
     python-2.4.3-19.el5.i386.rpm \
     libxml2-2.6.26-2.1.2.i386.rpm \
     libxml2-python-2.6.26-2.1.2.i386.rpm \
     expat-1.95.8-8.2.1.i386.rpm \
     python-elementtree-1.2.6-5.i386.rpm \
     sqlite-3.3.6-2.i386.rpm \
     python-sqlite-1.1.7-1.2.1.i386.rpm \
     elfutils-0.125-3.el5.i386.rpm \
     rpm-python-4.4.2-37.el5..i386.rpm \
     m2crypto-0.16-6.el5.1.i386.rpm \
     python-urlgrabber-3.1.0-2.noarch.rpm \
     yum-3.0.5-1.el5.centos.2.noarch.rpm
   rpm -Uvh http://mirror.centos.org/centos-5/5.0/os/i386/CentOS/$file;
done

and trying to 
     #yum -y update
this command one error is showing in command prombt

         There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   /usr/lib/python2.4/site-packages/rpm/_rpmmodule.so: undefined symbol: rpmdbCheckTerminate

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
2.4.3 (#1, Jan 21 2009, 01:10:13) 
[GCC 4.1.2 20071124 (Red Hat 4.1.2-42)]

If you cannot solve this problem yourself, please go to 
the yum faq at:
  http://wiki.linux.duke.edu/YumFaq

so guide how to install yum perfectly on centos 5 server?


regards 
s.kannan


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