You have attempted to use COM+ Conversation support, and an error was generated accessing the database. You must specify ...

You have attempted to use COM+ Conversation support, and an error was generated accessing the database.  You must specify a valid DSN in the construct string of the COMSvcs.Conversation component. For information on what a valid DSN is, see the documentation for the SQLDriverConnect API in MSDN or the Platform SDK. An example of a valid DSN is "DSN=Conversation".%0