Local Interbase Server problems

is Interbase running ?

>I have instaled Local InterBase Server 4.2.

>The first time I menage to login with default username and password.
>The next time (I have shutdown windows) when I try the next error shows:
>-"Error logging into the requested server"
>-"cannot attach to password database"

>Where is that password database.

>What can be a problem.
>Plase help.