Oracle ODI JDBC driver for SQL Server 2005 connection error

I am using Oracle ODI 11.1.1.7 version on a Windows 7 64bit machine. I want to connect to a SQL Server 2005 database using the driver com.microsoft.sqlserver.jdbc.SQLServerDriver.

I have downloaded and installed from Microsoft the drivers

• Microsoft JDBC Driver 4.1 for SQL Server

and also

• Microsoft JDBC Driver 4.0 for SQL Server

But I still have a connection error:

ODI-26039: Connection failed

Java.lang.RuntimeException: java.lang.IllegalArgumentException: Could not load JDBC driver class [com.microsoft.sqlserver.jdbc.SQLServerDriver]

Did anyone else experience this issue?

Thank you in advance.