Once you have set all necessary parameters, you will be able to access it normally from your ODBC Connect dialog in QlikView.
Hope that helps.
EDIT: It needs to be a user dsn. After trying with the driver you specified, it works better for me that the driver I posted, which actually worked on a Win 7 ultimate edition laptop connecting to two different 7 and 8 postgres servers. So I leave the comment just for information.