1. On your keyboard, press Windows key + R, type cmd, and press Enter.
2. Type sc delete "Sage 50 Database Connection Manager".
3. If you receive the error [SC] OpenService FAILED 1060, type: sc query type= service state= all.
4. Then re-enter the sc delete "Sage 50 Database Connection Manager" command.
5. Press F5 on your keyboard to refresh your Services list. You’ll see that the Connection Manager service is no longer there.
6. Press CTRL+SHIFT+ESC to open the Task Manager.
7. On the Processes tab, select Show processes from all users.
8. End the Simply.SystemTrayIcon.exe and the mysqld.exe processes if they’re running.
9. Go to the appropriate winsim folder.
   • 32-bit computers go to: C:\Program Files\winsim
   • 64-bit computers go to: C:\Program Files (x86)\winsim
   • Delete the ConnectionManager folder
10. Reinstall Sage 50.
11. Install any updates that you need, before the update that just caused the problem.
12. Restart the computer.
13. Open Sage 50 again.