Functioning Windows Live Mail 2012 stopped sending and receiving messages for my MSN email account.  New mail and folders viewable and usable on outlook.com.

I have reviewed most questions regarding this issue on the community site and I have found no solution, so I need HELP.

My machine is running Windows 7 64-bit.  Computer protected by Microsoft Security Essentials.

On 5/9/2014 Microsoft SQL Server 2005 Compact Edition [ENU] (3.1.0000) was installed.  (I did NOT do this.)  I do not run SQL server and do not need it. I notice that SQL Server Compact 3.5 SP2 [ENU] and x64 [ENU] are present and installed 5/19/2011.  I may not need these unless they are needed by the system or other programs.  This may have been the cause or related to the issue.  No other recent program installation activity

Updates are current.  No update installed in the last few days when checked in Control panel.