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This issue usually happens when the Application Pool assigned to the websites (Smart Scan Server (Integrated) or Local Web Classification Server) is True for the "Enable 32-bit Applications" (or enable32-bitApponWin64) option. An application pool is a group of one or more URLs that are served by a worker process or a set of worker processes.

The Smart Scan Server (Integrated) and Local Web Classification Server websites use the Default Application Pool upon installation. By default, the "Enable 32-bit Applications" (or enable32-bitApponWin64) is False in IIS 7 on Windows 2008.

In certain situations, like running OfficeScan on a web server where it is hosting other applications, IIS may be configured with the Default Application Pool with True. This may cause errors as seen in the screenshots above.

To resolve this issue, create a new Application Pool to be used by the Smart Scan Server (Integrated) and Local Web Classification Server websites and make sure the option "Enable 32-bit Applications" (or enable32-bitApponWin64) is False.

For more information on how to create an Application Pool in IIS, refer to the following article: Create an Application Pool (IIS 7).