I just created a new database in "Microsoft SQL Server Management Studio Express" and now I'm in "ColdFusion Administrator" and I'm trying to add my database as a Data Source. How do I do that? I believe the servername is `.\SQLEXPRESS` but I'm not sure what the default username and password are. I've tried creating a new login through Management Studio with an actual username and password, but those aren't working either. The error I'm getting is:

```
Connection verification failed for data source: xxx
java.sql.SQLNonTransientConnectionException: [Macromedia][SQLServer JDBC Driver]The requested instance is either invalid or not running.
The root cause was that: java.sql.SQLNonTransientConnectionException: [Macromedia][SQLServer JDBC Driver]The requested instance is either invalid or not running.

```

I can see that the service *is* running, and I can connect to it through management studio. I've tried following a couple tutorials online, but they don't seem to be working for me. Ideas?