Hi Fireblade123,
Based on my understanding, at first both your application and the database reside on your machine and all works well. Then you install your application on another machine and the problemis that the appolicationcouldn'tconnect to the database that resides on your machine. If I'm off base, please feel free to let me know.
As Franking has pointed out, the SQL Server 2005 doesn't support remote connection by default. Follow the KB article Franking provided to support remote connection in your SQL Server.
In addition, if the database you want to use changes, e.g. moves to a new server, you need to change the connection string accordingly.
Hope this helps.
Ifyou have any question, please feel free to let me know.
Sincerely,
Linda Liu