All of a sudden the Logon box that requires username and password appears and it won't accept my username or password that has not changed in over 10 years.  I have tried to repair Windows Essentials which completes successfully and still doesn't work.  I have tried to reinstall Windows Live Mail and it gives me an error message that I need to turn on Windows Firewall, which I have and still nodda.  Any help is very much appreciated.

Thanks.