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Online Manual of Registry First Aid 4.1
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Error Categories
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Registry First Aid can scan the registry for different error categories. Initially, all found registry items are grouped by error category. See a Screenshot.
And they have different icons when displayed in the list grouped by safety level.

·Orphan file/folder references.  
Registry entries containing references to nonexistent files or folders.

·Invalid font references.  
Invalid records of installed fonts.

·Auto run programs.  
Registry keys with auto-start programs. Invalid entries are selected for correction by default. All other entries are listed for your information only.

·Obsolete Start Menu items.  
Entries remaining after deleted or moved shortcuts from the Start Menu.

·Invalid help file references.  
Invalid records of help files registered in the system.

·Invalid application paths.  
Invalid records of applications registered in the system.

·Invalid shared DLLs.  
Entries remaining after deleted or moved common DLL files, removed applications.

·Invalid known DLLs registry references.  
Invalid DLL aliases remaining after moved/deleted .dll files.

·Unused software entries.  
Empty registry keys remaining after removed programs. Entries that do not contain any values.

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