I recently upgraded to Helicon Techs ISAPI Rewrite 3. When trying to import my old version 2 ini file I recieved the error “The referenced assembly is not installed on your system” in the Event Log. After a couple searches I discovered that I didnt have some of the Visual C++ libraries installed.
Windows 2003 Server (Advanced)
Installing this package resolved the issue. Microsoft Visual C++ 2005 Redistributable Package (x86)