I'm running IIS 7.5 on Windows 7 Ultimate. I've installed PHP Version 5.2.14 using Microsoft Web Platform Installer. I've created a virtual directory and a file with which I can browse it and it returns all the PHP information just fine. I'm trying to install MantisBT, and when I copy all the file to my virtual directory and browse index.php I receive the following error detail: Error Summary HTTP Error 500.0 - Internal Server Error The page cannot be displayed because an internal server error has occurred. Detailed Error Information Module FastCgiModule Notification ExecuteRequestHandler Handler PHP_via_FastCGI Error Code 0x00000000 Requested URL http://localhost:80/mantisbt/index.php Physical Path V:\wwwroot\mantisbt\index.php Logon Method Anonymous Logon User Anonymous I've changed these in the php.ini file: fastcgi.impersonate = 1 fastcgi.logging = 0 cgi.fix_pathinfo=1 cgi.force_redirect = 0 The Handler Mappings have this information: Request path: *.php Module: FastCgiModule Executable: C:[Path to PHP installation]\php-cgi.exe Name: PHP_via_FastCGI Thank you for any advice on this!!