Thank you for your post, and I apologize for the late reply.
Even with FileMaker Server 9, you had to enable the web server. Run http://localhost
This will let you know if the web server is set up.
To enable ISAPI, try the options for Windows Vista in Chapter 6 of our Getting Started manual (http://www.filemaker.com/downloads/documentation/fms10_getting_started_en.pdf).
Since this post is almost two months old, I am assuming you found a solution. If so, please post here so that others can benefit.