Looks like your database server is not running.
Please try the following steps.
1. Right click on My Computer -> Manage -> Services and Applications -> Services
2. You will find two services from 'Firebird'
3. Right click on 'Firebird Server'. Click 'Start'
4. Right click on 'Firebird Server'. Click 'Properties' and set 'Startup type' to 'Automatic'.
This should solve your problem. If it doesn't, please let us know.