Jack,
This is a known issue with AV manufacturers that don't support the API.
Check out the article at http://support.microsoft.com/?id=282207. There is
no way to force the use since the developers of the AV did not intend on it
ever calling this API.
Newer engines by the company may or may not have this API call enabled.

Signature
Chris Nicholas, MCSE
"A man may fail many times, but he isn't a failure until he begins to blame
someone else."
--Knox Manning
> How can I force Excel 2002 to use the installed virus
> scanner (eTrust EZ Antivirus) to catch infected macros?
> When I click Tools | Macros | Security, the window
> says "No virus scanner installed." Please let me know.
> Thanks in advance.