Analysis Services Evaluation > Standard downgrade

Hi

I installed Sql Server 2012 Evaluation Edition.

After I downgraded it back to a properly-licensed Standard edition the Analysis Services service would not start, complaining:
"MSSQLServerOLAPService: “The service cannot be started: … The 'Analysis Services in Tabular Mode' feature is not included in the '64 Bit Standard' edition of Analysis Services"

I can understand what this is telling me, and I see that Tabular Model is not part of Standard Edition.

My question is this:
Is there something I can do to remove the unlicensed features, or do I need to uninstall and reinstall the whole kit and caboodle?

Thanks

jim