64/32 bit error? I found this as a problem as my dev machine was 32bit and the production server 64bit. If so, you may need to call the 32bit runtime directly from the command line.
This link says it better (No 64bit JET driver): http://social.msdn.microsoft.com/forums/en-US/sqlintegrationservices/thread/da076e51-8149-4948-add1-6192d8966ead/