Windows Live Mail keeps on sending same email (with attachment) to same person

The problem started this morning when I was re-sending emails to a person (whose email address is in my list of contacts). I sent them about 30 or so emails, all of which went through. On the very last email (for some reason or another) the WLM program just kept on (and keeps on -- for the last 4 hours) re-sending the same email. I'd estimate that over 80 of the same email has been sent to the same person. I am using Windows 7 Home Edition and the WLM is the 2012 edition. Thanks in advance for any and all assistance. NOTE: I also have the "scan emails" function turned off in my Avast! anti-virus (has been turned off for the last 3 months now).