What problem when you start excel and pop up message on and cannot close?

When you start Excel and encounter a pop-up message that cannot be closed, it may indicate an issue such as an add-in malfunction, a corrupted file, or a software conflict. This can prevent you from accessing the application normally. To resolve this, try opening Excel in Safe Mode by holding the Ctrl key while launching it, which disables add-ins. If the problem persists, consider repairing the Office installation or checking for updates.