>>>Thank you, Borislav. Are you saying that the reason I am getting access problem is because the name of the server is incorrect?
>>
>>
>>No, I didn't said that.
>>I just said that if you attached your DBs in SQL Express that is installed as in instance (default SQLXPRESS) tnen you can't connect to your DB.
>>
>>When you run SSMS what you see?
>
>Thank you for clarifying. When I run SSMS I see the database and can open and view tables and data. I think Sergey is right that I didn't install the ODBC driver that causes my problem.

You didn't install ODBC driver?
Didn't it came pre-installed with Windows? (I mean Driver=SQL Server) not any of the Native clients.