Now that you have SQL Server all installed there is one more configuration change you need to do in order to make SharePoint happy. You need to change the max degree of parallelism. Don’t ask me what that is. Something about number of processors and how SQL uses them. Unfortunately SQL Server defaults to 0 and SharePoint 2013 necessitates, demands, forces, requires, and otherwise really wants you to set it to 1. So make the change. If you are running SharePoint 2010 this change is not required but is recommended.
Now if you look at the link I gave you saw a bunch of fancy SQL to change it. Barf! Let’s change it the easy way, with a mouse.
From your newly installed SQL Server click Start > All Programs > Microsoft SQL Server 2012 > SQL Server Management 2012.
On the Connect to Server screen click Connect. If for some reason the Server name: field is blank you would just type in the name of the server.
At the top of the Object Explorer window you see your server. Right click on it.
From the menu that appears click Properties.
In the Select a page section click Advanced.
Scroll to the bottom and change Max Degree of Parallelism from 0 to 1.
That does it. No need to reboot or anything else to make the change take effect.