The first view examines CLSID (OLE components) objects that don't have a handler or server due to missing files.
The second view examines ProgID entries. The ProgID reveals registry objects with corrupt entries.
The third view, TypeLib View, search all entries in the HKEY_CLASSES_ROOT\Typelib for TLB files without registry entries.
The Interface View searches HKEY_CLASSES_ROOT\Interface hive entries that has a TypeLib sub-hive is checked to determine that there is a match between the TypeLib entry's CLSID and a valid OLE object.
Very powerful tool - use at your own risk. It is probably safe to delete CLSID entries and ProgID entries flagged. It is probably NOT safe to delete TypeLib and Interface entries flagged unless you are absolutely sure they are a problem. Remember that the word "probably" is a statement about probabilities not assurances. Only download RegMaid.exe from Microsoft's site.