trying to connect to SQLServer with dblib.lib / dbopen() fails

  I'm trying to setup the correct string to connect to a server on 
localhost (window 7, VC++).

here is the code:

         login = dblogin();
         DBSETLAPP(login, "northwind");
         DBSETLPWD(login, "123123");
         DBSETLUSER(login, "stam");
         dbproc = dbopen(login, "GAL-PC");
         dbloginfree(login);
         dbexit();

as for the data here: I'm trying to use the northwind database on the 
local server.

when I'm using the server management studio, I'm able to login using 
this username and password
the database name is "northwind" and "GAL-PC" is the name of the server 
(and of my computer).

any ideas why dbopen doesn't work, is ther another way of getting the 
correct variables?

thanks,
Gal