In Easy Mode Registry Healer will keep last used settings. By default all fixed drives will be searched for corrections.
The option to scan the registry for empty entries is available only in Expert mode. This requires a high knowledge of the operating system and registry. Please read the Empty entries topic.
You may switch between Easy and Expert modes using the top menu: Advanced -> Switch to Expert/Easy Mode. Also Registry Healer contains two shortcuts in the Programs menu: Registry Healer Easy Mode and Registry Healer Expert Mode.