You can help protect your documents from macro viruses by selecting an appropriate security level in Microsoft Office 2000. A macro virus is made up of harmful code written in the macro language of programs. These viruses can do serious harm to programs and data. Excel and PowerPoint are set to the medium security level by default.
Word is set to the high security level by default.
When the security level is set to high, macros must have digital identification stamps indicating that the macros have not been altered. Otherwise, when you open a document, Office automatically disables macros without notice. When the security level is set to medium, you are prompted to enable or disable macros in documents when you open the documents. It is recommended that you disable a macro if you do not know who created it. When the security level is set to low, Office performs no macro checking when you open a document and enables all macros.