You see - in preferences - the EDIT button is key...if you want to change a SHELL to something harmless...just change it to a 'non-functional program' upon your computer...and upon my laptop that was MICROSOFT WORD which had finished it's trial...non-functional...that fucked most ill cult viral files - once I had done that one to one of them...the whole 'cache' of that file changed to MICROSOFT WORD...you get the picture?