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RE: I need your help, I have one Laptop Latitude c640, but I cann'y access or enter because I forget the password administartor, how I can delete this password ?.

It won't help (and isn't free).  You must call Dell with verification of ownership of the system.  The call will cost you $60 -- it may be cheaper to simply buy another used C640 system, since the system is probably worth less than that.

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