It's still not working. I gave the domain administrator account permissions for the DCOM options and have the same account starting the MapGuide Service. The RPC locator service is set to manual startup, so I started it, then tried to restart MapGuide with no success. I re-booted the server, started the RPC locator service, tried to start MapGuide and it still didn't work.
Thanks for the post, I'll keep working on it.