When I run the Calc command it returns Unknown command: Calc. If I choose to turn on the calculator tab nothing is added. Is the calculator still available in RhinoVersion 6 SR17.

It the plug-in enabled in Options > Plug-ins?

Yes, it is enabled and it autofills the command while typing it in but it then gives an error that is an unknown command once I hit enter. Is it working on other peoples install of Version 6 SR17. If so perhaps I need to run a repair on the rhino install or some such operation to correct my issue.

Try right-mouse clicking it in the Options > Plug-ins page, and click Load
I suspect there will be an error that might be helpful.