[sql-server] SQL Server Express CREATE DATABASE permission denied in database 'master'

i have same problem, and i try this:

  1. log In As Administrator on your PC
  2. log In SQL Server Management Studio as "Windows Aunthication"
  3. Click Security > Login > choose your login where you want to create DB > right click then Properties > click server roles > then checklist 'dbcreator'.
  4. Close and log in back with your login account.

This worked for me, and hope will help you.

*sorry for my bad english