Mudar o SQLEXPRESS para mixed Mode:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.1\MSSQLServer
LoginMode =2
Criar usuário no SQLEXPRESS
SQLCMD -S.\SQLEXPRESS -E
sp_addLogin ‘username’, ‘pass’
GO
sp_addsrvrolemember ‘username’, ‘sysadmin’
GO