DFS Installation Failure

I'm attempting to install DFS Namespaces and Replication on a SBS 2011 server.  THe installation fails with the following errror messages:

Please refer to the full log at: 'C:\Windows\logs\ServerManager.log'

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What appears to be the relevant portion of the above-references log is:

18320: 2012-07-02 21:03:21.182 [CbsUIHandler]              Initiate:
18320: 2012-07-02 21:03:21.182 [InstallationProgressPage]  Installing...
18320: 2012-07-02 21:04:17.364 [CbsUIHandler]              Error: -2147010893 :
18320: 2012-07-02 21:04:17.364 [CbsUIHandler]              Terminate:
18320: 2012-07-02 21:04:18.661 [InstallationProgressPage]  Verifying installation...
18320: 2012-07-02 21:04:18.817 [CBS]                       ...done installing 'DFSR-Infrastructure-ServerEdition DFSN-Server '. Status: -2147010893 (800736b3)
18320: 2012-07-02 21:04:18.942 [FileServer]                Skipped configuration of 'DFS Replication' because install operation failed.
18320: 2012-07-02 21:04:18.942 [FileServer]                Skipped configuration of 'DFS Namespaces' because install operation failed.
18320: 2012-07-02 21:04:18.942 [Provider]                 
[STAT] ---- CBS Session Consolidation -----
[STAT] For
          'DFS Replication',
          'DFS Namespaces'[STAT] installation(s) took '75.0969471' second(s) total.
[STAT] Configuration(s) took '0.0042538' second(s) total.
[STAT] Total time: '75.1012009' second(s).

18320: 2012-07-02 21:04:18.942 [Provider] Error (Id=0) Sync Result - Success: False, RebootRequired: False, Id: 102
18320: 2012-07-02 21:04:18.973 [Provider] Error (Id=0) Sync Message - OperationKind: Install, MessageType: Error, MessageCode: -2147010893, Message: Attempt to install DFS Replication failed with error code 0x800736B3., AdditionalMessage: The referenced assembly is not installed on your system
18320: 2012-07-02 21:04:18.973 [Provider] Error (Id=0) Sync Result - Success: False, RebootRequired: False, Id: 101
18320: 2012-07-02 21:04:18.989 [Provider] Error (Id=0) Sync Message - OperationKind: Install, MessageType: Error, MessageCode: -2147010893, Message: Attempt to install DFS Namespaces failed with error code 0x800736B3., AdditionalMessage: The referenced assembly is not installed on your system
18320: 2012-07-02 21:04:18.989 [InstallationProgressPage]  Sync operation completed
18320: 2012-07-02 21:04:18.989 [InstallationProgressPage]  Performing post install/uninstall discovery...

I've run the System Update Readiness tool and 4 seemingly unrelated errors were fixed and the attempted install of DFs still fails with the same result.

Any thought?

Thanks,

Steve

steve mcgrath