1. Select Control Panel, Administrative Tools, then Services.
2. Right-click Sage 50 Database Connection Manager.
3. Select Stop.
4. Right-click Sage 50 Database Connection Manager.
5. Select Start.
   • If you encounter the message "The Connection Manager could not be stopped. You need administrator rights", follow the instructions to fix. 
6. Try to open the company file.

Reinstall the program

1. Uninstall Sage 50.
   • Right-click on the Windows Start, Apps and Features
   • Find the Sage 50 version you’re trying to repair and click Uninstall
   • Follow the wizard to complete the uninstall
2. Reinstall Sage 50 following How do I reinstall Sage 50?
3. Verify the company file will now open.

Reinstall the Connection Manager

1. Right-click the Command Prompt, then select Run as Administrator from Windows Start.
2. Type: sc delete Sage 50 Database Connection Manager.
   • If you receive an error "[SC] OpenService FAILED 1060:" on the command-line type: "sc query type= service state= all" then re-enter "sc delete "Sage 50 Database Connection Manager"
3. Select the F5 key to refresh your Services list, then verify the service is no longer listed.
4. Confirm the service deletion. Open Task Manager (CTRL+SHIFT+ESC). On the process tab, click or check Show processes from all users.
5. End the Simply.SystemTrayIcon.exe process.
6. 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 Connection Manager folder
7. Repair the Sage 50 installation. See Option 1 in How to repair the Sage 50 installation.

Data is on Remote Data Access

1. Re-download a copy of the company file giving the error from Remote Data Access.
2. Choose the location and file name and click Save.
   • To overwrite the file with the error, select the same name and location.  Then click Yes when prompted to confirm the overwrite
   • After the company file finishes downloading and syncing, it will open normally

Move the files out of a cloud-synchronized folder

1. Identify if your data is in a cloud folder.
2. If the files are in a cloud-synchronized folder, relocate the files to a new folder. The best location is on the c:\

Verify if the SAJ folder has a read-only attribute

1. Close Sage 50.
2. Browse to the location where the company file resides.
3. Right-click the folder with the extension SAJ.
4. Select Properties.
5. Clear the Read-Only box if a checkmark is there.
6. Select OK.
7. Restart Sage 50 Accounting and try to open the company file again.

Verify all files and folders are visible in the SAJ folder

1. Browse to the location where the company file resides.
2. Right-click the SAJ folder.
3. Select Properties.
4. Clear Hidden box checkmark if one is there.
5. Select Apply.
6. Select OK.
7. Open the SAJ folder.
8. Verify that all your files are within the SAJ folder.

Restore from backup

1. Find a recent backup CAB file.
2. Restore the backup.