You need to delete the cookies for each user and untick remember my details that should them request both username and password at signin.Turn system restore off as well to delete any saved bits there may be.
To: Old Shep,Idle And Wild, and VoG, VoG's solution to my problem certainly had its merits. Unfortunately the MSN hotmail addresses were not shown for deletion within the 'Stored Usernames and Passwords' box. The only e mail address shown is my main address from my ISP.
Also to A NICKNAME and temp003, Have also tried your suggestion of deleting cookies, but offending MSN hotmail addresses still refuse to be deleted from my screen But thanks for your suggestion.