Cannot draft new message or reply to incoming; can’t send but receive fine.

Windows Live Mail 2012; when attempting to reply to an incoming email, the following error message (in it's entirety!) appears:  "A problem occurred trying to open this message. A problem has occurred. Please try again." When attempting to draft a new outgoing message, the same error message appears. I cannot draft an email, whether as a reply or as a new email; therefore I can't send any messages. I did the Windows Live Essentials repair but no success. This problem has been addressed numerous times but no reply has actually resulted in success. This email program has been my favorite but my only recourse is to remove it and use an alternate. FYI: this is the third problem I have posted; no one has successfully solved any of them. Pretty poor help forum, eh?