Richard is 100% correct, but I would like to add to his comments. Since you installed GP prior to installing SQL, I would assume GP was installed without creating a connection to SQL. This is also an important component to get GP to run properly. If you look in the documentation folder Richard referred to, you will find an installation manual for GP, which will walk you through the steps of creating an ODBC connection. This is what lets GP and SQL talk. You will also need to run GP Utilities and create databases. Be sure to go through the installation manual carefully and if there are any items in there you are not comfortable with, you may want to get some assistance.