[newbie] Uninstalling Multiple Packages

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LM 6.0 came with a mandrake gtkzip and accidentally i installed another
gtkzip rpm.  Both of these two packages are registered separately in RPM
but were installed into the same location.  When i was trying to
uninstall one of them, RPM stopped with an error message saying "gtkzip
specifies multiple packages."  So how do I uninstall one of them. or
just both of them?  If i don't uninstall any packages how do I delete
one entry in RPM?
thanks