ISC ERROR CODE:335544375 - unavailable database

If you are getting this error the Firebird server is not running.
Go to START -> CONTROL PANEL -> Classic View, and Double click on the Firebird Server Manager.
Start the service.
Default settings should be:
Use the Gaurdian - ticked.
Run as a service.
Start automatically.
Go to START -> CONTROL PANEL -> Classic View, and Double click on the Firebird Server Manager.
Start the service.
Default settings should be:
Use the Gaurdian - ticked.
Run as a service.
Start automatically.