how to install yum in RH enterprise ??

Hi.I want to install yum in my RH enterprise, I went
to this page and download yum rpm 

http://atrpms.net/dist/el3/yum/

It doesn't work,  May I know how to check the RedHat
Enterprise version ? Whether it is EL3 or EL4 ?
My uname -a is as follow

[root@bb ct]# uname -a
Linux bb.xx.com 2.4.21-20.0.1.ELsmp #1 SMP Wed Nov 24
20:34:01 EST 2004 i686 i686 i386 GNU/Linux


and it gave me the following error when I install the
yum, What's the problem

[root@bb ct]# rpm -ivh yum-2.4.2-69.el3.at.x86_64.rpm
warning: yum-2.4.2-69.el3.at.x86_64.rpm: V3 DSA
signature: NOKEY, key ID 66534c2b
rpmdb: Program version 4.2 doesn't match environment
version
error: db4 error(22) from dbenv->open: Invalid
argument
error: cannot open Packages index using db3 - Invalid
argument (22)
warning: cannot open Solve database in
/usr/lib/rpmdb/i386-redhat-linux/redhat
rpmdb: Program version 4.2 doesn't match environment
version
error: db4 error(22) from dbenv->open: Invalid
argument
warning: cannot open Solve database in
/usr/lib/rpmdb/i386-redhat-linux/redhat
rpmdb: Program version 4.2 doesn't match environment
version
error: db4 error(22) from dbenv->open: Invalid
argument
warning: cannot open Solve database in
/usr/lib/rpmdb/i386-redhat-linux/redhat
rpmdb: Program version 4.2 doesn't match environment
version
error: db4 error(22) from dbenv->open: Invalid
argument
warning: cannot open Solve database in
/usr/lib/rpmdb/i386-redhat-linux/redhat
rpmdb: Program version 4.2 doesn't match environment
version
error: db4 error(22) from dbenv->open: Invalid
argument
warning: cannot open Solve database in
/usr/lib/rpmdb/i386-redhat-linux/redhat
rpmdb: Program version 4.2 doesn't match environment
version
error: db4 error(22) from dbenv->open: Invalid
argument
warning: cannot open Solve database in
/usr/lib/rpmdb/i386-redhat-linux/redhat
rpmdb: Program version 4.2 doesn't match environment
version
error: db4 error(22) from dbenv->open: Invalid
argument
warning: cannot open Solve database in
/usr/lib/rpmdb/i386-redhat-linux/redhat
error: Failed dependencies:
        /usr/bin/python2.4 is needed by
yum-2.4.2-69.el3.at
        /usr/lib64/python2.4/site-packages/libxml2.py
is needed by yum-2.4.2-69.el3.at
        /usr/lib64/python2.4/site-packages/rpm is
needed by yum-2.4.2-69.el3.at
        python(abi) = 2.4 is needed by
yum-2.4.2-69.el3.at
        python-elementtree is needed by
yum-2.4.2-69.el3.at
        python-sqlite is needed by yum-2.4.2-69.el3.at
        urlgrabber is needed by yum-2.4.2-69.el3.at

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