Thanks HanShi.
I didn't install "Sql Server Management Studio Express" because user no need use.
could you tell me, where can I run this query?
Please explain me, little more detail.
I check this code in query window, It is working well but user have no knowledge how to use query window and setting password.
USE [master]
GO
ALTER LOGIN [sa] WITH PASSWORD=N'new_password'
GO
Thanks Again,
thenndral