Wayne Scot

I'm sure hundreds of people have had this problem. Am using XP Home and Windows Messenger is totally out of the picture, but when MSN Messenger signs on, a message pops up that sez "You are signed on at another location or computer. Click here to sign on again." Then another message pops up saying the other location has been signed out. MSN Messenger works fine except for this annoyance. Only one computer is involved, there is no other. Anyone have an idea? Tnx