You can use the Notes Install Cleanup Executable (NICE) tool to clean up a failed install, failed uninstall or failed upgrade. You can also use the tool to uninstall an existing version of Notes, and clean up extraneous files, before performing an upgrade install. The tool is available for Lotus Notes 6.x and higher installations on supported Windows platforms only and must be run by an administrator.

Technote #1459714 :Using the Lotus Notes Install Cleanup Executable (NICE) tool