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You should not directly edit your Windows registry as doing so would pose a high risk on the integrity of your machine. You can modify many of ArcGIS options from the user interfaces for ArcMap, ArcCatalog, ArcToolbox and ArcScene. The few options not available from the interface can be modified by using the ArcMap Advanced Settings utility.
Use ArcMap Advanced Settings utility to make modifications to ArcMap options that may or may not be available in the user interface.