When you open a database or database template, you might be prompted with a security alert. Databases can include potentially unsafe functions using the Microsoft Jet Expression Service and additional programming code called macros, which can contain viruses. You can protect your computer from viruses by running up-to-date antivirus software and setting your macro security level to high for maximum protection or medium for lesser protection. When you set the macro security level to high, some database functionality, such as wizards, is disabled. If macro security is set to medium, database users will be prompted to enable macros. Prompts also might appear to block potentially unsafe functions.
Set Macro Security
Enable Macros When You Open a Database