When I open a template in Excel 2000, I get the following warning message:

"This workbook contains a type of macro (Microsoft Excel version 4 macro)
that cannot be disabled. There may be viruses in these macros. If you are
sure this workbook is from a trusted source, click yes. Open the workbook?"

I've commented out all macro and other vba code and still get this message.
How can I determine what is causing it?

Thanks
Rut