Problems with ODBC connectivity

I have developed a PHP application that accesses a Microsoft Access database through ODBC. The application works well using PHP version 4.1. I have recently installed the newest version of PHP (4.2.3) on another machine running NT4, and IIS 4. Again, I am using an ODBC connection, and have given this connection the same name, login, and password as is present in my PHP files. While the PHP module is running fine, I cannot retrieve records from the database, probably indicating a problem with my connectivity to the ODBC. Again, I have made the same settings in the new ODBC entry as is present on the development machine. Could there be a version problem with the PHP module? Any other suggestions would be greatly appreciated. Thanks, Bill