Windows Live Mail 2012 corrupted and want to stop the message “Recovering the Windows Live Mail Database” when starting the program.

Problem started when I reverted from Windows 10 to Windows 7. Corrupted database duplicated all emails (not contacts). Can delete only one email at a time by dragging it to Delete folder. Can't open most old emails. Upgraded from Live Mail 2011 to Live Mail 2012 with no changes. I tried to repair Windows Essentials via Control Panel's Programs and Features but that didn't work saying the program was in use. (It wasn't). The program is working fine for all new email messages received and sent. I just wish I could repair the database sufficiently to stop getting the message "Recovering the Windows Live Mail Database" whenever I start the program.