Windows live mail will not work properly despite numerous RE installations

When I start wlm it opens up as normal.  It downloads new messages into the inbox only.  The unreal Email folder is never refreshed or updated.  Then that's about it.  I can do nothing else.  You might try to open the mail we'll get the error message: a problem occurred while trying to open this message or a problem have occurred.  You can compromise an Email but you will not be able to send it.  Whether or not you type in a valid Email address or just leave the field blank, when you press the send button you will get the error message saying that some of the recipients for this message are not valid.  The automated address completion facility does not work.  When you try to access the contacts you receive the error message saying unable to reduce recipients.  I have uninstalled and reloaded numerous times in attempts to resolve this.  It doesn't appear to be a program fault.  Perhaps it might be that I have deleted or corrupted essential files that the program needs to access to run smoothly.  Unfortunately I do not have an earlier backup date that can be restored.