[root@radiowave rpm]# vzyum 401 install yum
exec /usr/bin/yum -c /vz/template/centos/4/i386/config/yum.conf --installroot /v                                                                                                 z/root/401 install yum
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   /usr/share/vzpkgtools/vzrpm43/lib/python2.4/site-packages/rpmmodule.so: wrong                                                                                                  ELF class: ELFCLASS32

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, 13:57:05)
[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