Empty Registry Keys are created all the time on the computer when you move, uninstall or delete items. This is usually a Category where there are often found Error/Entries that are incorrect or Empty. While not necessarily an error, generally empty keys offer no advantage to remaining in the registry. This option removes detected empty registry keys that contain no value information. Some keys are sometimes place in programs as place-holders whether they are used or not. In some cases, some keys are considered "Self-healing", which means that even though the key is deleted and thought to offer no value, some programs automatically will recreate these keys. If you run into keys that are self-healing, you always have the option to add them to the Ignore list found under SETTINGS in WinMaximizer.