Examine your settings at ToolsOptionsSecurity tab, Macro security. That is
the path in Excel 2003, it may be different in other versions.

--
Kind regards,

Niek Otten

Microsoft MVP - Excel

"Divertor Chris" <Divertor wrote in message
...
I have successfuly written a worksheet function in Excel using VBA. However
when I return to the spreadsheet after saving it, the function no longer
works. I receive an error message from visual basic which says that the
macros are deactivated, but gives no clue how to reactivate them.