Unable to run yum

Please hint on this error and suggest a solution

Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
'import site' failed; use -v for traceback
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

  No module named yum

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:
2.4.2 (#1, Feb 12 2006, 03:59:46)
[GCC 4.1.0 20060210 (Red Hat 4.1.0-0.24)]

all the following python modules have been installed

python-elementtree-1.2.6-4.2.1
libselinux-python-1.29.7-1.2
MySQL-python-1.2.0-3.2.2
gnome-python2-desktop-2.14.0-1
gnome-python2-canvas-2.12.4-1
gnome-python2-gtkhtml2-2.14.0-1
python-2.4.2-3.2.1
dbus-python-0.61-3
python-sqlite-1.1.7-1.2
python-numeric-23.7-2.2.1
python-ldap-2.0.6-5.2.1
audit-libs-python-1.1.5-1
libxml2-python-2.6.23-1.2
gnome-python2-2.12.4-1
gnome-python2-extras-2.14.0-1
python-devel-2.4.2-3.2.1
libxslt-python-1.1.15-1.2.1
gnome-python2-gtksourceview-2.14.0-1
mod_python-3.2.8-3
gnome-python2-gnomeprint-2.14.0-1
gnome-python2-bonobo-2.12.4-1
gnome-python2-gnomevfs-2.12.4-1
rpm-python-4.4.2-15.2
python-urlgrabber-2.9.8-2
postgresql-python-8.1.3-1


Thanks,
    Regards,
       Khan

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