Uninstall existing - postgesql 7.3.2

Hi,
I am using Redhat Linux 9, I need to uninstall postfesql 7.3.2 and
i have to install postgresql 7.4.5. Plz let me know how to uninstall
completely - postgesql 7.3.2

I am getting as [root(at)set root]# rpm -e postgresql
error: package postgresql is not installed

if i try to check the version it was displaying
[root(at)set root]# postgres --version
postgres (PostgreSQL) 7.3.2

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S.ElayaRaja
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