How would you ensure that all relevant registry entries were removed in the event that installation of your application failed?

How would you ensure that all relevant registry entries were removed in the event that installation of your application failed?
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Answer :

You can ensure that registry entries are removed, as well as perform any other “clean-up” tasks, by creating an Installer class and writing the appropriate code in the Rollback event handler. Then create a new Custom Action and set the InstallerClass, and EntryPoint properties to appropriate values.
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