The ArArCALC software uses macros written in Visual Basic for Applications (VBA) for Microsoft Excel. In general, these kind of macros may also provide a security risk, if being used for hacking purposes. To circumvent any risk of opening files that may contain certain malicious software code, Microsoft Excel takes some (default) security measures to protect its users. For example, when you install the Microsoft Excel software for the first time, it does not allow you to open any file that has VBA Macros attached to it, like ArArCALC. In addition, it will not trust (how nice) the Visual Basic Project provided by ArArCALC. So, to enable ArArCALC to run on your computer, follow these instructions:

• Open the Security Dialogbox via the Tools # Macro # Security menu.
• In the Security Level tab set the level to Medium.

• In the Trusted Publishers tab be certain to check the Trust Access to Visual Basic Project checkbox.

• Click OK.