• Windows security profile or settings are corrupt
• Outdated Windows OS

• Ensure your system meets the Sage 50 CA 2024 System Requirements
• Some older versions of Windows 10 can't be updated via the standard Windows update

Troubleshooting options with an IT professional:

1. Ensure Windows is updated to the latest version.
2. Completely uninstall and reinstall Sage 50. 
3. If Sage 50 was recently working before a recent Windows update, restore the system to the last Windows restore point.
4. Create a new Windows profile.
5. Open Sage 50 on another administrator profile
6. Reset Windows if the issue still exists after creating a new Windows profile.
7. Turn off VPNs.
8. Various firewall / antivirus suites could also block Sage 50 from running. See Which processes and ports do I need to allow through my anti-virus / firewall to ensure that Sage 50 Canadian Edition will operate correctly?
   • Ensure there are no expired antivirus installed - re-subscribe or remove from the system
9. Remove malware/spyware/adware - see Method 1 in Program doesn't open when opening a file or using the program icon