trying to install yum to later get an updated version of php but I cant get passed this step...

---> i tried this
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error: Failed dependencies:
/usr/lib/python2.4/site-packages/libxml2.py is needed by yum-2.3.4-62.rh9.at
/usr/lib/python2.4/site-packages/rpm is needed by yum-2.3.4-62.rh9.at
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--> then I tried this
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[root@Server]# rpm -ivh libxml2-2.6.9-0.99_10.rh9.at.i386.rpm
warning: libxml2-2.6.9-0.99_10.rh9.at.i386.rpm: V3 DSA signature: NOKEY, key ID 66534c2b
Preparing... ########################################### [100%]
package libxml2-2.6.9-0.99_10.rh9.at is already installed
file /usr/lib/libxml2.so.2 from install of libxml2-2.6.9-0.99_10.rh9.at conflicts
with file from package libxml2_2-2.6.19-1_20.rh9.at
[root@Server]#

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---> at this point i dont know what to do so I tried this

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[root@Server]# rpm -Uvh libxml2-2.6.9-0.99_10.rh9.at.i386.rpm
warning: libxml2-2.6.9-0.99_10.rh9.at.i386.rpm: V3 DSA signature: NOKEY, key ID 66534c2b
Preparing... ########################################### [100%]
package libxml2-2.6.9-0.99_10.rh9.at is already installed
file /usr/lib/libxml2.so.2 from install of libxml2-2.6.9-0.99_10.rh9.at conflicts
with file from package libxml2_2-2.6.19-1_20.rh9.at
[root@Server]#

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I have never messed around with these rpms can anyone help??? ive been stuck for a week on the same spot .. a lttile more info in case it helps any

the goal I am trying to achiee is upgrade php from 4.1... to 4.3... with the gd support
I really dont care how I get to the outcome just thought installing yum and having it do the work would be great... Also it is a virtual server running plesk reloaded i think its 7.1. I have root access. thanks again!