Interdev setup vs IIS 5.1

I have recently started working at a site where asp (VBScript) is the language of choice. They use notepad to edit scripts, and have never heard of source debugging, or Interdev.
I have installed Interdev on my workstation, but the debugger doesn’t load the script pages. I have debugging enabled on IIS (ver 5.1).

When I start debugging on a simple script, I get: Unable to set server into correct debugging state automatically. You may not be able to debug ASP pages….

I recall something similar to this when I installed Visual Studio.NET on my laptop with IIS 5.1. It had something to do with the order in which I installed the programs, was overwriting the Front Page Extensions.

I’m sure someone out there has seen this problem.