Installer Issue with Windows server 2012 and SQL server 2012

Question

I am getting following error while installing and Windows Installer(made from .net setup and deployment) in Windows server 2012 environment. Please look the steps we have made so far for the attached picture. Its an installer basically deploys an app in the IIS and Create a db to a server where we are pointing it too.

 

"Create Database permisson denied in Master"

 

Steps we tried yet

1. Added “domain\user” in security\users and assigned “db-owner” role

2. Added computer name “computername$” same as step 1

3. Given above users permission in master,msdb,xmps database

4. In computer management, I have added above user in administrators and power users group

5. Set up is run as administrator