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A solution is documented here . Essentially the installer sort of assumes you do not have Oracle 10g Express Edition installed, but if you do you have to physically remove two Oracle service to run this installer.
just one remark: Installing more than one XE instance (including two different versions) is not even unsupported, but even prohibited by license restrictions. See the [url http://download.oracle.com/docs/cd/E17781_01/license.112/e18068/toc.htm]Licensing Information (section License Rights) for details.