Strange Memory Read Error When Loading DLL From PHP

I have a Windows 2000 server running IIS 5.0 with PHP 4.3.1. I am trying to load a COM object within PHP. If I try $MyObject = new COM ("ADODB.Connection"), I get an error saying: php.exe - Application Error The instruction at "0x32432432" reference memory at "0x34343". The memory could not be "read". I can load ADODB.Connection or any other DLL from ASP without problems. The problem is not localized to that one DLL, I get the same error message loading any DLL from PHP. I can load "Excel.Application", but that ProgId corresponds to an exe. The really strange thing is that I can load a DLL I wrote in C#, and as long as I load that DLL first, I can load any other DLL without errors. For instance: $myobj = new COM("NETdll.Test"); $con = new COM("ADODB.Connection"); will work without problems, assuming "NETdll.Test" is my C# dll. But if I comment out that line, I'll get the memory error again. I tried the same calls on another server with the same configuration, and I get the same problem. Any help or suggestions would be greatly appreciated.