sql server 2012: cannot alter the login sa

Question

I\'m trying to create a database on my local machine using SSMS version 11.0.2100.60. I\'ve run the application as administrator, logged in using Windows authentication, and

Answer 1

I found the answer here:

In order to start SQL Server in single-user mode, you can add the parameter “-m” at the command line. You can also use the SQL Server Configuration Manager tool, which provides proper controls for the file access and other privileges. To use the Configuration Manager tool to recover your system, use the following steps:

1. Open the Configuration Manager tool from the "SQL Server 2005| Configuration" menu
2. Stop the SQL Server Instance you need to recover
3. Navigate to the “Advanced” tab, and in the Properties text box add “;–m” to the end of the list in the “Startup parameters” option
4. Click the “OK” button and restart the SQL Server Instance