When I see this
I usually look for any Excel Add-ins and disable them all, then add them back in one at a time, testing all the time.
Is there anything in Excel > Tools > Options for Macro controls, eg scanning? If so, change or disable those.
In ZA's own Control Panel, make sure that Excel 97 has full authority, (Computer > Application Control), eg Trust Level = Super. In this area look at the other options to see what is available.