This really got me frustrated for a few days until a colleague pointed me in the right direction. The issue concerns actually displaying your 32-bit ODBC control panel in 64bit windows.
I was trying to install and setup some 32-bit drivers to an open source database engine within Windows Server 2008. I have been aware for a long time that there are both 32 and 64 bit versions of the ODBC control panel in windows and have set up both in the past (though it had been a while since i had to do 32-bit on 64 bit system.)
I kept running odbcadm32.exe using the “Run..” dialog box. This kept opening up the 64 bit ODBC control panel and had me really confused. The trick is to specify the path and run c:\windows\syswow64\odbc32adm.exe Both versions have the same filename and windows will choose the 64bit by default!