I recently ran into a problem with the command prompt not autocompleting when using TAB. Instead it inserted a regular TAB character.
It turned out that for some reason all values under the registry for the current user had been removed.
To reset the values I copied working registry values from another computer and inserted these into the registry.
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Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\Software\Microsoft\Command Processor] "CompletionChar"=dword:00000009 "DefaultColor"=dword:00000000 "EnableExtensions"=dword:00000001 "PathCompletionChar"=dword:00000009