After a successful uninstallation is reported back through uninstall log files, delete the productregistry file prior to running a subsequent installation. To verify that a previous uninstallation has completed successfully, look for a appserv_uninstall.class file in <install_dir>. This file will not be present if the uninstallation was successful.
Do not delete the productregistry if the uninstallation was not successful.
The productregistry file is located in /var/sadm/install on Solaris and /var/tmp on Linux.