Hi,
You can rerun the installer and see if an upgrade will recreate the DB but i think this will fail. Or you could recreate the DB in MS SQL and then modify the wrapperContext.xml config folder in the datamanager/WEB-INF folder on the NAC and change the value <prop key="hibernate.hbm2ddl.auto">update</prop> from update to create and restart the NAC this should force the creation of the DB tables. Once the NAC is working change the setting back to update.
Finally as the data is all lost the other solution is to uninstall the NAC and then rerun the installer.
Regards
Keith