Hi dragon99,

No ODBC driver is required (this is my experience).
U only need Oracle sqlnet client installation (and tnsnames.ora
with the right configuration) to perform reverse
engineering. If you can connect to the db from NT client
(for example with sqlplus) you should also be able
to do reverse engineering using the right
service/username/passwd with ERWin.

Maybe you installed DAO support at the end
of ERWin installation and you are still
trying to use ODBC to access the db?
Try using only SQLNet.

Regards