How can I change from SQL Server Windows mode to mixed mode (SQL Server 2008)?

Question

I have installed SQL Server 2008 Express Edition, but by mistake I kept the Windows authentication mode.

Now I want to change that to SQL Server mixed mode. How can

Answer 1

If the problem is that you don't have access to SQL Server and now you are using mixed mode to enable sa or grant an account admin privileges, then it is far easier just to uninstall SQL Server and reinstall.