At the risk of repetition you should really contact firstname.lastname@example.org
But, in the meantime … Rosetta is a semi-obsolete MacOS component which is not included in OSX 10.6. It's not clear to me why you should need it, and in fact suggests some larger computer problem.
In Mac OS X v10.6 "Snow Leopard", Rosetta is not included by default
but can be installed from the Optional CD or automatically downloaded by
the system if needed.