Why is Deep Freeze showing an event error in the system logs indicating that the DFServ Service is marked as interactive?

On workstations running Vista and Windows 7 workstations will show a warning in the event viewer with the following message:

The DF5Serv service is marked as an interactive service. However, the system is configured to not allow interactive services. This service may not function properly.

This is an expected behaviour with Deep Freeze on workstations running Windows Vista or Windows 7.