Relational Connection in IDT - ODBC not working

Hi All

I have BO 4.0 on my machine and i am trying to create a connection for my Universe.I am trying to connect to SQL Server 2008 through ODBC connection.But while creating the relational connection i don't see my ODBC connections in the Data Source Name  drop down.The created data source name should automatically be populated there.

Also when i write the ODBC connection name manually in the Data Source Name, i get the Error "The specified DSN contains an architecture mismatch between the driver and application".

Any help on this will be greatly appreciated..