Dynamics CRM 2011 installation error

When I'm installing Dynamics CRM 2011 in my laptop I got a error message like this "You do not have sufficient permission to perform this operation on the specified organization database when installing dynamics crm 2011" below is how to solve it:

1. Open your MS SQL Server
2. Go to security and server roles
3. Mapping / add your administrator domain or the current user account who logging the server that used CRM database server to Sysadamin Server Roles.
4. Try one more the installation process.

Good luck..