Follow the link below to download a free copy. StrangeDays Virus Woody's Office Watch reported on a new virus that can cross-infect Office 97 documents. Follow the link below for more information from Sophos. You can then choose to disable the macros or not, depending on how well you trust the source of the file. This isn't really a very good method, and many users simply turn off this option to avoid the message when a file is opened.
Developers are able to electronically sign their projects.
When you open such a file, you can be assured who the author is. Many software products exist that scan your files for known viruses.