Problem with 'Ctrl' key


My 'ctrl' key somehow becomes assigned to new and strange functions, like opening the start menu, opening 'help' guides, changing zoom and even tabs on firefox, and things like that. It has happened a few times now, and as mysteriously as it happens it also eventually goes off.

Does anyone ever heard of a similar problem? Is there anyway I can prevent this from happening? Is there some strange hotkey that alters the functions of basic buttons?

Thanks in advance

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