You can turn it off on your system, but it doesn't travel with your
presentation. So, if you move or distribute the presentation, the message will
come back. See:
"Some files can contain viruses ..." message when clicking a hyperlink
http://www.rdpslides.com/pptfaq/FAQ00406.htm

Signature
Sonia Coleman
Microsoft PowerPoint MVP Team
Autorun Software, Templates and Tutorials
> When adding a hyperlinked file a message stating "this may contain a virus"
> and asks if I want to open the file appears. How do I turn this off? There
> is no virus!!!