Argh - a follow-up re ODBC 32 and 64 bit-ness:
http://blog.danovich.com.au/2010/02/02/odbc-settings-on-64-bit-servers/
It's way crazier than you'd ever expect. Both the 32-bit and 64-bit
versions are called "odbcad32.exe" but are in different (but not
distinctively named) locations.
http://support.microsoft.com/kb/942976/en-us
*bangs head against desk*
--
Craig Ringer