so, doesn't it work if you try to install an rpm using the text mode?.
you can try to install rpmdrake
rpm -i rpmdrake-blah-blah.rpm (first switch to superuser)
Just look for rpmdrake in
www.pbone.net, www.rpmfind.net, ...
it is now late but for other times,
if you have any conflict with other files, don't uninstall anything, you can use (text mode)
rpm -U packageName to Update or
rpm -i --force packageName to force the installation
hope this helps