A second account under Herman Richard has opened up (this is my name in reverse!)

I had trouble recently with my Windstream hook-up and they said the problem was with the service to me and not my system. As a result, I was provided with a new modem and had to re-connect. Since then, my Outlook Express account has picked up a second account which uses my name in reverse. Herman is my family name. When I try to send some of my mail, I get that error message window and my mail does not get sent, but goes to the outbox. Any help here?