I tried to set a password on it again, but I’m getting the following error: “This workbook contains Excel 4.0 macros or Excel 5.0 modules.

Macros in Microsoft Office are blocked for security reasons, but you can enable and use signed macros. This tutorial explains how to create a self-signed digital certificate.

Learn how to use a data validation control to allow users to select when to run multiple VBA procedures in Microsoft Excel.