I know this question already exists but I couldn't find a solution for me. So, I'm using windows 10. There are two accounts (both admin) with the only difference that my account is not the first created when windows was installed.
This was my process from the beginning:
I have installed sql server expressSP1 2016 and SSMS. (and yes at the end of sql installation the sql administrator was me: PC-Name/myname)
I ran SSMS and connected to the server with server-name: PC-NAME \SQLEXPRESS
Ran the query Create database newDatabase
.....and I got the error.
The weird thing is that if I run SSMS from the other Account I don't have problems. It let me create the database!
Is there a configuration in SSMS that I'm missing or is Windows that somehow won't grant me admin role?