I have a network with one Windows 2003 Small Business Server. I get a journal wrap error after every reboot for the past week. I've seen the instructions on how to fix this, but before I do I'd like to know if File Replication Services should even be running if there's only one server in the domain.
If you only have one domain controller in your network, then yes you can turn off File Replication services (FRS).
If you have a primary domain controller and secondary domain controller or backup domain controller, then I would look at fixing FRS.
This service runs by default in the case that you promoted another DC. Had you ever at any point had another DC in this network?