The Web Service on 64 Bit versions of Windows

If you intend to run the Web Service on a 64 bit version of Windows, you must configure the Application Pool to allow 32 bit applications.

Step 1.   Navigate IIS to the Application Pool as described in Step 6 above.

Step 2.   Select Advanced Settings.

Step 3.   In the ‘Advanced Settings Dialog’, set the ‘Enable 32 Bit Applications’ to True.