operating system: Windows 7

Windows Live Mail 2012

Windows live mail will not operate properly.  When starting there are error messages assertion failed, also Netframework errors 0xC00CE556, and uninstaller.browser stopped working error.  This happened at startup when the previous day there had been no problems or configuration changes. I have run repair on both windows live mail 2012 and net framework.  As of now I can receive mail but can not forward, send or reply to mail.