Dynamics GP 2013 Service Pack error

Greetings experts,
I just successfully installed a service pack in my computer. Then I launched GP 2013 and it asked me to run utilities and I did so. But then what I did not understand is that I got a message that it could not find any instance of GP 2013. What I did, I just clicked next and got the error message below. I tried running a repair from control panel but to no avail. I have searched many sites but haven’t found a solution. I am running Windows 7. Any help will be appreciated.

A system database name was not supplied. Run a repair of the Microsoft Dynamics GP installation.
