I have received an e-mail from (removed for security reasons) advising that a "DGTFX Trojan virus" has been detected in my windows live folders. They require my user name & password so that my account can be "upgraded to a new 1024-bit RSA key anti-virus firewall". They further advise that my e-mail account will be terminated if I do not respond..Can you please adivse if this is a legitimate e-mail to which I should respond.