[root@localhost ~]# yum update
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   No module named storagefactory

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, May 24 2008, 13:47:28)
[GCC 4.1.2 20070626 (Red Hat 4.1.2-14)]

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

[root@localhost packages]# find /var/cache/yum/ -name "rpm*"
/var/cache/yum/base/headers/rpm-python-4.4.2-48.el5.i386.hdr
/var/cache/yum/base/headers/rpm-libs-4.4.2-48.el5.i386.hdr
/var/cache/yum/base/headers/rpm-4.4.2-48.el5.i386.hdr
/var/cache/yum/base/packages/rpm-4.4.2-48.el5.i386.rpm
/var/cache/yum/base/packages/rpm-libs-4.4.2-48.el5.i386.rpm
/var/cache/yum/base/packages/rpm-python-4.4.2-48.el5.i386.rpm

[root@localhost packages]# rpm -Uvh /var/cache/yum/base/packages/rpm-4.4.2-48.el5.i386.rpm /var/cache/yum/base/packages/rpm-python-4.4.2-48.el5.i386.rpm /var/cache/yum/base/packages/rpm-libs-4.4.2-48.el5.i386.rpm
Preparing...                ########################################### [100%]
   1:rpm-libs               ########################################### [ 33%]
   2:rpm                    warning: /etc/cron.daily/rpm created as /etc/cron.daily/rpm.rpmnew
warning: /etc/logrotate.d/rpm created as /etc/logrotate.d/rpm.rpmnew
########################################### [ 67%]
   3:rpm-python             ########################################### [100%]